User Profile

[waxhead]

I am not fan of Apple , but the M1 seems interesting. Just maybe there is a faint chance that the M1 can kick off a RISC-V based CPU soon that will have...

[waxhead]

So the world is beautiful even without nVidia? then what graphics card manufacturers do you suggest?...

[waxhead]

Absolutely. I find swapfiles a bit scary as (from what I know) they seem to violate just about anything a file is. A swapfile apparently is not much different...

[waxhead]

I would say that even with zram you would need physical swap regardless. If you swapoff /dev/zram0 for example it would be good to have some backing storage...

[waxhead]

Are you sure? What if happens if a page is "swapped" out to zram and never used again (e.g. LRU) it will just stay in memory consuming space...

[waxhead]

Got it - just like multilevel cache right? e.g. LRU to swap cache first, then LRU of that to SSD, then LRU of that again to HDD (or even tapedrive haha...

[waxhead]

Out of curiosity - what do you mean about multilevel swap awareness? Localizing allocation of swap to NUMA nodes perhaps? And yes, from the little I know...

[waxhead]

Well my develish little friend, it is all about utilizing memory for something useful. And you are right - it all depends on how much memory you have,...

[waxhead]

Actually no, I was not aware of that - thanks for educating me. On the other hand that is less important as long as decompression speed > disk speed...

[waxhead]

Yes, or rather sort of. First I found some benchmarks on the web where zstd was compared to lz4 on smaller files. On my system the page size is 4k so...

[waxhead]

Agree, zswap is a much better solution. I used to use zram until I learned about zswap. They appear similar and I don't think that everyone realize how...

[waxhead]

I do agree that it seems sensible to only write if a corruption is detected.

Offlining of memory happens after a certain amount of single...

[waxhead]

Ok, but this is not quite how I have understood patrol scrub. Unlike what you correctly describes as a standard RAID consistency check, patrol scrub reads...

[waxhead]

BOTH ZFS and BTRFS are prone to memory errors on the host system. E.g. if corrupt data is written to disk, you will get the same corrupted data back....

[waxhead]

Ok , I quickly read the man page. It seems like memory trolling is "just "memory scrubbing and that it requires ECC to even work at all. At...

[waxhead]

Thanks for that, I was not aware of that. The reason it is not seen elsewhere might perfectly well be that memory chips are worse than we believe. Actually...

[waxhead]

Sure, you may be very unlucky or very lucky. Regardless having some memory working on a memory module is usually better than not having anything working...

[waxhead]

Well Windows might be one of those yes. I remember when Vista came out , everyone was complaining that Windows did use so much memory suddenly. Well it...

[waxhead]

I would argue that row-hammer proves that MANY cells in your ram module are bad. If you know how RAM is supposed to work you must agree that you should...

[waxhead]

I really like the first link. It is a done once pr. startup so it is far from perfect, but should catch really broken stuff and it is better to run once...