mirror of
https://git.proxmox.com/git/mirror_zfs.git
synced 2024-12-26 03:09:34 +03:00
16f42e1b6d
For interrupt coalescing, cv_timedwait_hires() uses a 100us slack/delta for calls to schedule_hrtimeout_range(). This 100us slack can be costly for small writes. This change improves small write performance by passing resolution `res` parameter to schedule_hrtimeout_range() to be used as delta/slack. A new tunable `spl_schedule_hrtimeout_slack_us` is added to preserve old behavior when desired. Performance observations on 8K recordsize filesystem: - 8K random writes at 1-64 threads, up to 60% improvement for one thread and smaller gains as thread count increases. At >64 threads, 2-5% decrease in performance was observed. - 8K sequential writes, similar 60% improvement for one thread and leveling out around 64 threads. At >64 threads, 5-10% decrease in performance was observed. - 128K sequential write sees 1-5 for the 128K. No observed regression at high thread count. Testing done on Ubuntu 18.04 with 4.15 kernel, 8vCPUs and SSD storage on VMware ESX. Reviewed-by: Richard Elling <Richard.Elling@RichardElling.com> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Reviewed-by: Matt Ahrens <mahrens@delphix.com> Signed-off-by: Tony Nguyen <tony.nguyen@delphix.com> Closes #9217 |
||
|---|---|---|
| .. | ||
| avl | ||
| icp | ||
| lua | ||
| nvpair | ||
| spl | ||
| unicode | ||
| zcommon | ||
| zfs | ||
| .gitignore | ||
| Makefile.in | ||