On Sun, Jan 3, 2021 at 1:41 PM Matthew Miller <mattdm@xxxxxxxxxxxxxxxxx> wrote: > > On Sun, Jan 03, 2021 at 08:46:33PM +0100, Alessio wrote: > > What about that story related to the drop in the Btrfs performances in > > Kernel 5.10? Is it still true? Can we perform some specific test? > > Looks like a fix is on the way: https://marc.info/?l=linux-btrfs&m=160883350502962&w=2 > > It would be interesting to see if the performance regression is caught with > `sudo ./runtests.sh -t performance` as part of the standard test day tests. I haven't experienced it day to day. But I can reproduce it as originally described. I'm not seeing kernel-test suite pick up on anything file system specific, but I do see quite a weird result for 16p/64K context switching. It's ~3 for 5.9 and ~83 for 5.10. Processor, Processes - times in microseconds - smaller is better ------------------------------------------------------------------------------ Host OS Mhz null null open slct sig sig fork exec sh call I/O stat clos TCP inst hndl proc proc proc --------- ------------- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- fmac.loca Linux 5.9.16- 3396 0.05 0.11 0.91 1.66 2.45 0.11 0.72 794. 2338 3244 fmac.loca Linux 5.10.4- 3396 0.06 0.10 0.84 1.66 2.77 0.12 0.73 838. 2312 3298 Context switching - times in microseconds - smaller is better ------------------------------------------------------------------------- Host OS 2p/0K 2p/16K 2p/64K 8p/16K 8p/64K 16p/16K 16p/64K ctxsw ctxsw ctxsw ctxsw ctxsw ctxsw ctxsw --------- ------------- ------ ------ ------ ------ ------ ------- ------- fmac.loca Linux 5.9.16- 3.2700 2.3000 4.0800 2.8600 2.8400 3.04000 3.28000 fmac.loca Linux 5.10.4- 3.2800 3.5900 5.3500 2.8400 3.1500 3.03000 83.0 *Local* Communication latencies in microseconds - smaller is better --------------------------------------------------------------------- Host OS 2p/0K Pipe AF UDP RPC/ TCP RPC/ TCP ctxsw UNIX UDP TCP conn --------- ------------- ----- ----- ---- ----- ----- ----- ----- ---- fmac.loca Linux 5.9.16- 3.270 5.154 14.1 25.5 25.8 40. fmac.loca Linux 5.10.4- 3.280 6.072 13.0 25.7 23.5 44. File & VM system latencies in microseconds - smaller is better ------------------------------------------------------------------------------- Host OS 0K File 10K File Mmap Prot Page 100fd Create Delete Create Delete Latency Fault Fault selct --------- ------------- ------ ------ ------ ------ ------- ----- ------- ----- fmac.loca Linux 5.9.16- 16.4 16.3 25.2 20.0 1751.3K 0.357 0.00260 1.124 fmac.loca Linux 5.10.4- 16.8 16.7 26.1 20.0 1726.9K 0.335 0.00260 1.184 *Local* Communication bandwidths in MB/s - bigger is better ----------------------------------------------------------------------------- Host OS Pipe AF TCP File Mmap Bcopy Bcopy Mem Mem UNIX reread reread (libc) (hand) read write --------- ------------- ---- ---- ---- ------ ------ ------ ------ ---- ----- fmac.loca Linux 5.9.16- 4150 9401 4573 6874.8 10.7K 6556.7 4081.1 9265 6472. fmac.loca Linux 5.10.4- 4045 9500 4534 6597.2 10.3K 5523.1 4034.5 9107 6076. [chris@fmac kernel-tests]$ -- Chris Murphy _______________________________________________ test mailing list -- test@xxxxxxxxxxxxxxxxxxxxxxx To unsubscribe send an email to test-leave@xxxxxxxxxxxxxxxxxxxxxxx Fedora Code of Conduct: https://docs.fedoraproject.org/en-US/project/code-of-conduct/ List Guidelines: https://fedoraproject.org/wiki/Mailing_list_guidelines List Archives: https://lists.fedoraproject.org/archives/list/test@xxxxxxxxxxxxxxxxxxxxxxx
