3 ms·

Using https://old.reddit.com/r/VFIO/comments/eryb71/best_storage_for_vfiokvmqemu_experiment_results/ https://old.reddit.com/r/VFIO/comments/eryb71/best_storage_

Using https://old.reddit.com/r/VFIO/comments/eryb71/best_storage_for_vfiokvmqemu_experiment_results/ https://old.reddit.com/r/VFIO/comments/eryb71/best_storage_f... setup and truecrypt + zfs raid with lz4 compression I never see cores even visibly affected by either compression or encryption, the speed seems to hit the actual underlying hardware speeds pretty reliably, and this machine CPU is not anything to be amazed about in current year (Ryzen 7 2700 stock clocks with the performance governor) Actually I was a bit curious about this so just tried reading some raw images off the zfs pool with no directives against caching or anything to hit the absolute maximum possible read speeds, even with the read speeds getting well above 1GB/sec it still wasn't showing any visible impact on any cores in terms of either truecrypt or zfs. Almost wondering if they're hidden somehow at this stage. If they're not though it seems the performance impact is so low it gets nowhere near restricting throughput compared to uncompressed / unencrypted speeds.

kbenson 7y ago
If it's a Ryzen Pro, it has dedicated encryption/decryption hardware which might be being used. The old Via mini-itx systems had this, which allowed them to speed up AES operation massively, to the point that it was basically free to run an encrypted FS (and in their cases, it definitely had a CPU cost, around 10-20% of their single core IIRC, but that was a decade ago, and I'm not sure I could find the blog entry that person did now).
- etherael 7y ago
  Brief search on Ryzen pro seems to imply it's some kind of mobile integrated graphics / cpu solution? I don't think the Ryzen 7 2700 is one of those as it's just a plain old am4 desktop board CPU of the ryzen2+ generation, that said, it does have AES hardware encryption support in the instruction set according to https://en.wikichip.org/wiki/amd/ryzen_7/2700#Features https://en.wikichip.org/wiki/amd/ryzen_7/2700#Features so that may well be what's going on with the seeming complete lack of overhead there.

kbenson 7y ago

If it's a Ryzen Pro, it has dedicated encryption/decryption hardware which might be being used. The old Via mini-itx systems had this, which allowed them to speed up AES operation massively, to the point that it was basically free to run an encrypted FS (and in their cases, it definitely had a CPU cost, around 10-20% of their single core IIRC, but that was a decade ago, and I'm not sure I could find the blog entry that person did now).

etherael 7y ago
Brief search on Ryzen pro seems to imply it's some kind of mobile integrated graphics / cpu solution? I don't think the Ryzen 7 2700 is one of those as it's just a plain old am4 desktop board CPU of the ryzen2+ generation, that said, it does have AES hardware encryption support in the instruction set according to https://en.wikichip.org/wiki/amd/ryzen_7/2700#Features https://en.wikichip.org/wiki/amd/ryzen_7/2700#Features so that may well be what's going on with the seeming complete lack of overhead there.