* Posts by Kobblestown

57 publicly visible posts • joined 20 Oct 2015


Micron joins the CXL 2.0 party with a 256GB memory expander


Re: Compression? ;)

Maybe they talk about the bandwidth of the memory chip array behind the controller. Unlike DRAM, PCIe is full duplex, so the aggregate BW of said link is 32GB/s write + 32GB/s minus the protocol overhead. I assume you wouldn't really have read-only or write-only use case, so you can benefit from the full duplex nature of the link for mixed workloads.

You can run Windows 11 on just 200MB of RAM – but should you?


Yep, SCSI offerred better queueing capabilities. And SATA 1.0 didin't really have any. Sure, it did have it in theory and it was more SCSI-like with TCQ but it required controller support and those were few and far between. Also, I think WD's first Raptor was the only drive that had it. NCQ only came with SATA 2.0 IIRC.

In any case, SCSI had lower CPU overhead. And faster spinning drives. I think only the (Velocy)Raptors ever ventured above 7200 rpm with SATA, whereas SCSI went as far as 15K! Could have been more than twice faster than a 7200 drive for random IO - not an insignifficant difference.


Re: What disk?

Should be a RAM disk for best experience

SpaceX reportedly fed up with providing free Starlink to Ukraine


"the most corrupt nation in Europe."

That would be Russia, right? Or do we still count it in Europe?

USB-C to hit 80Gbps under updated USB4 v. 2.0 spec


Re: Educate me please?

TB4 is mostly the same as TB3. It simply raises the minimum requirements but the max throughput is the same. I guess that would mean that not all USB4 controllers will be created equal but doesn't mean that they will necesarrily be slower than TB4.


Re: Educate me please?

AFAIK, USB-C video signalling uses Alternate mode which repurposes the USB3 data links for use as a video link. In the case of HDMI, this is specified for HDMI 1.4b which would have the effect you describe. You'd probably get better results with USB-C --> DisplayPort.

This also means that the data speed falls down to USB2 which is mandatory and uses separate wires.

Thunderbolt multiplexes the video data with regular data so the effective available data rate depends on the video data rate. It's a much better system and I'm hopeful that all USB4 implementations will support Thunderbolt, which should not be a big problem since they use the same PHY. Thunderbolt is trademarked by Intel who only allow its use for certified (by Intel, of course) devices but it can work without being formally certified, as in some Ryzen 6800U laptops.

22-year-old Brit avoids US extradition over SIM-swapping conspiracy after judge deems him to be high suicide risk


Re: The US penal system

I thought they spell it "penile" over there

Microsoft's do-it-all IDE Visual Studio 2022 came out late last year. How good is it really?


Re: VS 2022 is 64-bit

Maybe you can setup a VPN (WireGuard) that you connect to from the WSL VM so you can reach it easier? Do it for the lulz, man!

Microsoft drops 64-bit OneDrive into the pool: Windows on ARM fans need not apply. As usual


Re: Does it matter?

On amd64 architecture 64-bit applications perform better due to doubling the amount of registers. There may be a small hit by the larger pointer type but it's usually negligible.

Also, with 64 bit address space there's more room for ASLR and that's a security benefit.

And if we can get rid of all 32-bit applications on 64-bit windows we can probably kick WOW64 in the gutter. Although I'm sure MS will still use it for obscure reason that is not immediately obvious.

Linus Torvalds issues early Linux Kernel update to fix swapfile SNAFU


Re: swap space

Actually, as another reply to your post points out, it's always a good idea to have a couple of GBs as swap. Long gone are the days when the rule of thumb for swap size was twice the RAM. But Linux can swap out seldom used pages in order to free space for disk cache, if nothing else.

Personally, I prefer block device swap, rather than file swap. I use LVM and I'm usually in position to create a logical volume for additional swap if the going gets tough.

European Commission redacts AstraZeneca vaccine contract – but forgets to wipe the bookmarks tab


Re: Null and void

As a EU citizen I'm disgusted that anything in this contract was confidential to begin with.

Third time's still the charm: AMD touts Zen-3-based Ryzen 5000 line, says it will 'deliver absolute leadership in x86'


Re: Ryzen 3

However, the 3100 has two CCXs with half the resources each, whereas the 3300 has a single complete CCX. The latter is better because the core-to-core latency is much higher across CCX-s. So the difference is bigger than what the frequencies alone would suggest. Should still enough for a mom PC though.

As if you needed another reason not to use Visual Studio, C++ extension for Visual Studio Code is live


Re: C++

There's also Visual Studio Community which is a free stripped down version of the regular Visual Studio. It has everything most people need (much more actually - https://visualstudio.microsoft.com/vs/compare/). I'd see no reason to use VS Code for C++

Bada Bing, bada bork: Windows 10 is not happy, and Microsoft's search engine has something to do with it


"Paint3D is an effing awful regression."

Well, you can uninstall it. And reclaim 16KB if Apps & features is to be believed. So what do you expect from a 16KB software package? OTOH, maybe it's a miracle of software engineering and that would be the justification to silently reinstall it on the next major update. Resistance is futile.

Thinking about it, maybe they should rename it to Pain 3D.

Virtualization juggernaut VMware hits the CPU turbo button for licensing costs


Re: VMware

I am a huge KVM fan (haven't really tried Xen) but I assume VMware has features that are missing from KVM. I am trying to make use of the VMDq feature of intel NICs which is supposed to work out of the box on ESXi under the NetQueue moniker. But I cannot find any information on how to do this. I found some info that Xen 3.3 "will" support this (quite an old post obviously) but I couldn't find anything in the release notes of any Xen version that mentions VMDq.

As much as appreciate it, the FOSS world is not all roses, you know.

10nm woes, CPU supply shortages, competition from AMD... What? Sorry? Intel can't hear you over the cash register going bonkers


Re: Spectre-Meltdown-L1FT-Zombieload-et-al

Another possibility - the mitigations bring performance down so you need more cores just to keep the same level of performance.

Open-source Windows Terminal does the splits: There ain't no party like a multi-pane party


"What would be REALLY nice is if the console allowed ctrl+insert and shift+insert as well, similar to what you get in Cygwin's console."

Hey, I didn't know that. I'm using its Unix heritage which mandates that selection is copying and just middle-click to paste.

Open-source companies gather to gripe: Cloud giants sell our code as a service – and we get the square root of nothing


Re: "he can pay you to develop it. Or pay you for setting it up on premises"

"they develop it themselves and don't make it open, as the license doesn't require it"

Now whose fault is that? Maybe the FSF was on to something? Developing software with BSD/MIT type license is charity work, plain and simple.


Re: Repeat after me..

Open source (and software libre) do not exclude the profit motive. But that would be services one offers around it. Like someone wants a new feature, he can pay you to develop it. Or pay you for setting it up on premises, things like that. After all, companies that provide SaaS with OSS do pay their developers and admins. It's just that there's no artificial scarcity from which to extract exuberant profits.

At least that's how the theory goes. I'm not taking sides in this, just noting.



Truth be told, with GPL you are getting paid - with future improvements others make to the software. Not necessarilly so with other more permissive licenses.

IBM cuts ribbon on quantum computing centre wherein a 53-qubit monster lurks


"Can probably run Crysis"

It both can and cannot. On each of its qbits.

Enjoy the holiday weekend, America? Well-rested? Good. Supermicro server boards can be remotely hijacked


Jesus Fucking Christ guys! Has anyone been able to locate fixed BMC firmware for any board? I couldn't do it for mine (it lists an older version) but then I browsed around and couldn't find it for any board! WTF is going on?!



SM does a good job at acknowledging the flaw but the actual firmware for my Xeon E3-12xx line, X10-variety mobo is still missing. Anyone found updated BMC firmware for such boards?

AMD agrees to cough up $35-a-chip payout over eight-core Bulldozer advertising fiasco


Re: Spin and bullcrap

What about instruction decoder? Should a "core" have one?


Re: Rooting for AMD here

Imagine you have a multithreaded FP-heavy workload. With Bulldozer, if you run it as 4 threads or with 8 threads you'd get roughly similar performance. The 8 thread would probably be slightly faster because it would allow better utilization of the FPUs but OTOH it could thrash the shared L2 cache. Still, going from 4 thread to 8 threads will not result in anything akin to 2x the performance (disregarding Amdahl's law for the time being).

Now, there's always the possibility that for the 4 thread scenario a shitty OS would schedule the threads on every "core" on each of2 modules, rather than on single "core" for each of 4 modules. That would suck on its own although it would provide the 2x boost you'd expect - but has nothing to do with the point that I'm trying to make. Bulldozer was not an 8 core processor for any meaningful definition of the term. And I say this as an AMD fanboy. I hated them because they made me buy Intel CPUs. Only in the last 2 years have a returned to considering AMD for CPUs and I have advised the purchase of several Ryzen systems and built a ThreadRipper for myself. AMD's comeback is even more impressive because of the Bulldozer (and to a large extent the later iteration) fiasco. Part of which is the fake core-ness.


Re: Rooting for AMD here

"The chips did have eight cores, and each core was able to do floating-point arithmetic at full speed."

This is patently not true. Full speed would mean using both FMAC units. When two "cores" use FP operation they effectivelly (i.e. on a rough averge) use only one. Sure, in most cases you won't be hammering both cores with FP workloads but if your workloads are indeed FP heavy, then it performs like every module is single core.

BTW, I personally wouldn't get too worked up about the FPUs. In a comment above I clarify that in my opinion what turns BD in 4-core architecture is the shared instruction decoder. It makes BD modules glorified HyperThreading cores. Only in later designs this was rectified and those can reasonably (but not completely) be considered x2 core.


Re: Advertising

"AMD were completely accurate and precise using the normal meaning of the word core."

I disagree. Not because of the shared FPU but because of the shared instruction decoder. That is what is turning a Bulldozer's module implementation into a glorified HyperThreading core. Later designs with separate instruction decoders could reasonably be considered separate cores. Not Bulldozer.

Canonical adds ZFS on root as experimental install option in Ubuntu


Re: Wow

"Snapshots are not backups, not by a long stretch."

But due to send/receive they make for a great backup solution whereby you send the minimal changes between snapshots to a remote site.


Re: Oracle is a patient predator

"Unwarranted"? I need an actual proof that they don't do that...


Re: @AC - The SFC can kiss my taint...

I use ZFS on Linux but my rationale might be the same - I use ZFS because I value my data and I value my money. The first should go without saying but the second requires some explanation.

I need to be able to use RAID5 - RAID1 doesn't cut it in terms of how many droves I need. This means Btrfs is not an option. I am a huge fan of Btrfs because it offers some features that ZFS doesn't (also the other around of course) but I don't trust its RAID 5/6 implementation. Wheres ZFS is rock solid.

Then there's the caching support - I can configure an SSD as L2ARC cache without much hassle and have my huge (raltively) HDD array perform as well as an SSD after the cache has been warmed up (caveat emptor - on Linux the cache starts from zero after reboot)l. But with ZFS you can configure the cachine behavior per dataset (whether the ARC and/L2ARC cache metadata, metadata + data or none).

I have a friend who runs an 8-disk RAID-Z1 array with a 9th as hot spare and 6 Optane drives for cache. I did set it up for him and it only took like 5 min. Generally, ZFS is very easy to set up and maintain once you've wrapped your head around it. And the flexibility is great. As long as you don't have to shrink your zpool...

BTW, there are many important ZFS feature additions in the pipeline. I think adding a drive to a RAID set is one of them.

God DRAM you! Prices to slide more than 40% in 2019 because chip makers can't forecast


Re: Is this the year

Well, I already switched to SSD for my bulk storage (4x1TB in RAID-Z1). I have bought about 8TB of SSD storage for the last year or so and the prices keep falling.

However, you can combine the best of both worlds (on the HDD side being nothing more than the price, of course) by using ZFS with additional SSD(s) for L2ARC device(s). Once the cache has been warmed up it performs admirably. The only problem is that with ZFS on Linux the cache is empty after reboot but if you boot no more than once a month that's pretty much negligible.

Halleluja! The Second Coming of Windows Subsystem For Linux blesses Insider faithful


Re: But why?

"and swapping between boxen/virtuals is a PITA"

What do you mean "switch". I run several VirtualBox VMs and ssh into them from 'screen' sessions on Cygwin. Which also gives me a decent (if a bit sluggish) Linux command line on Windows too. I can, of course, use WSL to ssh to the VMs but I have problems running 'screen' on it. Then "switching" is simply Ctrl-A+<window number>.

In any case, Cygwin is always the second thing I install on a fresh Windows (the first is Firefox which I then use to download everything else). I really don't understand the lack of love for Cygwin. It's not very efficient but it works very reliably. You can even use it to set up ssh server on your Windows box.

Introducing 'freedom gas' – a bit like the 2003 deep-fried potato variety, only even worse for you


Re: Sleep is a Good Thing(TM)

I was about to write something similar but you beat me to up. The poster above reminds me of a co-student of mine at an oral exam. He complained that he told the professor everything yet he still failed him. I got the same ticket later that day and got an A. I may have known something more than said student thought was "everything"...

The problem is, people like the OP will say - yeah, you told the professor what he wanted to hear. Obviously, regular people on the street know more than any given professor in a University.

Dual carriageway to autobahn: Intel revs up Optane caching memory by doubling PCIe lanes


Optane is a great technology at the right price and for the right purpose. I use 6 Optane drives (4*16 + 2*32 ) as SLOG and L2ARC devices for a ZFS RAID-Z array with 8 disks. I got them at a good price and they work great. Although I don't consider them useful for anything else.

Want to train a dragon? You'll need 500 million files, 730TB of data, 54,000 CPU cores...


Re: Files

I don't know what you're talking about, but I'm pretty sure you're doing it wrong.

When two tribes go to war... Intel, AMD tease new chips at Computex: Your spin-free summary


Well, the server parts should be even twice that. Do the math: 2 chiplets - 72MB max, 8 chiplets - 288MB max. Most people can still remember the times when that was considered a good amount of main memory. Man, that's the amount of main memory the PS3 had!


The Ryzen 9 3900X has 70MB of cache (6MB L2 + 64MB L3)! Holy mother of God!

Now I know what CPU would Jesus run...

How much open source is too much when it's in Microsoft's clutches? Eclipse Foundation boss sounds note of alarm


Re: It's the monocolture of open source that led to this

I, for one, prefer GitLab.


Re: It will

Look son, I run Windows in a virtual machine under Linux KVM. With GPU & NVMe passthrough, although these are just for geek creds.

US minister invokes Maggie Thatcher, says she would have halted Huawei 5G rollout


God, no! They'll corrupt the inmates.

Disco Dingo fever: Ubuntu 19.04 has an infrastructure bent, snappier GNOME and another stupid name


Re: I really like Linux except :]

Well, you can also use the text-based minimalistic installer and select which desktop you want (Caveat emptor - I think it doesn't do EFI boot):


You can also install several desktop environments simultaneously and change them from the login manager.

For a KVM virtual machine there's even a better way - dig down a little deeper in the directories:


And download the kernel and initrd image of the installer. You can pass those to a KVM virtual machine to boot from.

I love the flexibility of this thing. I think that some time ago, if you started the installer kernel over a serial console it would even add the serial console option to the Grub defaults so you could access the virtual machine over serial console right after installation. This doesn't work with 18.04 so you better do this manually before rebooting the newly installed system. But I digress...

Court sees Morissette Meter flip out as Oracle assumes anti-arbitration stance in pay dispute


IANAL but I think forced arbitration is a perversion of justice. Still not siding with Oracle though.

Feeling a bit gassy? Toshiba floats 16TB helium whopper


Re: WTF is 550TB/year workload rating ? limited endurance or something else

"Basically the manufacturers state that if the overall workload is kept below this threshold then the reliability of the drive will be as advertised. Exceeding the WRL rating reduces the reliability conferred."

It's probably just an excuse to not honor the warranty.

Three more data-leaking security holes found in Intel chips as designers swap security for speed


Re: Middle ground

"avoiding leaking timing info generally means every instruction running for the worst-case time."

Not necessarily, IMO. You could have some flags in the cache that certain line was loaded speculatively and the flag is cleared when it's loaded for real. When it's in the cache but has the speculative flag then it's like not being there until the speculation is resolved. Obviously that would require hardware support but I think it's doable. I'm not a CPU designer though.

Oi, Mint 18.1! KEEP UP! Ubuntu LTS love breeds a laggard


Re: Linux Noob question

If your Wi-Fi sits on a mini-PCIe card, as is often the case, I'd rather replace it with something well supported under Linux, like the Intel ones. They go for about 10-20 quid on Amazon. Unfortunately, Wi-Fi is sometimes soldered on the mainboard. There are some pretty small USB WiFi controllers but their usable range might not be that good as opposed to using the antennas inside the laptop.

Microsoft's Blue Screen of Death dead in latest Windows 10 preview


Well, it's a SOD for sure!

Oracle finally targets Java non-payers – six years after plucking Sun


Re: VirtualBox Extensions Pack next?

The page at your last link greets me with a cookie acceptance dialog. Sorry, but I'm no longer clicking any "Agree and proceed" button at Oracle's site...



Just under the article (in the Whitepapers section) the first link is "Understanding the depth of the global ransomware problem". How appropriate.

Edit: Actually, I now see completely different list of whitepapers. Still, in light of the article, Java SE seems not much different from ransomware.

Database admin banned from Oxford Street for upskirt filming


In any case, this a sad testament to what Varna has become.

To make conclusions for a whole city by a single person is pretty shortsighted, to put it mildly.

Disclaimer: I'm from Varna and I аm shortsighted, or rather, myopic - like all Varnians (варненци).

Flying Spaghetti Monster is not God, rules mortal judge


Re: HERESY!!!!

Remember that this is the one religion where nobody has been killed in his name.

Sadly, I guess that's precisely what disqualifies it as religion...