On 11/23/20 10:53 AM, kernel test robot wrote:
Greeting,
FYI, we noticed a -25.5% regression of unixbench.score due to commit:
commit: 10a59003d29fbfa855b2ef4f3534fee9bdf4e575 ("[PATCH v2 5/5] locking/rwsem:
Remove reader optimistic spinning")
url:
https://github.com/0day-ci/linux/commits/Waiman-Long/locking-rwsem-Rework-reader-optimistic-spinning/20201121-122118
base: https://git.kernel.org/cgit/linux/kernel/git/tip/tip.git
932f8c64d38bb08f69c8c26a2216ba0c36c6daa8
in testcase: unixbench
on test machine: 16 threads Intel(R) Xeon(R) E-2278G CPU @ 3.40GHz with 32G
memory
with following parameters:
runtime: 300s
nr_task: 30%
test: shell8
cpufreq_governor: performance
ucode: 0xde
test-description: UnixBench is the original BYTE UNIX benchmark suite aims to
test performance of Unix-like system.
test-url: https://github.com/kdlucas/byte-unixbench
In addition to that, the commit also has significant impact on the following
tests:
+------------------+---------------------------------------------------------------------------+
| testcase: change | fio-basic: fio.write_iops -29.9% regression
|
| test machine | 192 threads Intel(R) Xeon(R) CPU @ 2.20GHz with 192G
memory |
| test parameters | bs=4k
|
| | cpufreq_governor=performance
|
| | disk=1SSD
|
| | fs=xfs
|
| | ioengine=sync
|
| | nr_task=32
|
| | runtime=300s
|
| | rw=randwrite
|
| | test_size=256g
|
| | ucode=0x4003003
|
+------------------+---------------------------------------------------------------------------+
| testcase: change | aim7: aim7.jobs-per-min 952.6% improvement
|
| test machine | 96 threads Intel(R) Xeon(R) Platinum 8260L CPU @ 2.40GHz
with 128G memory |
| test parameters | cpufreq_governor=performance
|
| | disk=4BRD_12G
|
| | fs=f2fs
|
| | load=100
|
| | md=RAID0
|
| | test=sync_disk_rw
|
| | ucode=0x4003003
|
+------------------+---------------------------------------------------------------------------+
A performance drop in some benchmark is expected. However, there are
others that can show improvement. Will take a look to see if we can
reduce the performance regression.
Thanks,
Longman
