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List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [linus:master] [btrfs] b7fdfd29a1: postmark.transactions 9.5% regression To: kernel test robot , Qu Wenruo Cc: oe-lkp@lists.linux.dev, lkp@intel.com, linux-kernel@vger.kernel.org, David Sterba , HAN Yuwei , linux-btrfs@vger.kernel.org References: <202510271449.efa21738-lkp@intel.com> Content-Language: en-US From: Qu Wenruo Autocrypt: addr=quwenruo.btrfs@gmx.com; keydata= xsBNBFnVga8BCACyhFP3ExcTIuB73jDIBA/vSoYcTyysFQzPvez64TUSCv1SgXEByR7fju3o 8RfaWuHCnkkea5luuTZMqfgTXrun2dqNVYDNOV6RIVrc4YuG20yhC1epnV55fJCThqij0MRL 1NxPKXIlEdHvN0Kov3CtWA+R1iNN0RCeVun7rmOrrjBK573aWC5sgP7YsBOLK79H3tmUtz6b 9Imuj0ZyEsa76Xg9PX9Hn2myKj1hfWGS+5og9Va4hrwQC8ipjXik6NKR5GDV+hOZkktU81G5 gkQtGB9jOAYRs86QG/b7PtIlbd3+pppT0gaS+wvwMs8cuNG+Pu6KO1oC4jgdseFLu7NpABEB AAHNIlF1IFdlbnJ1byA8cXV3ZW5ydW8uYnRyZnNAZ214LmNvbT7CwJQEEwEIAD4CGwMFCwkI BwIGFQgJCgsCBBYCAwECHgECF4AWIQQt33LlpaVbqJ2qQuHCPZHzoSX+qAUCZxF1YAUJEP5a 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mpLWhmkZdjcUHpLaiuH3TZYvxapyZVAV9mcIdELV459G9zQExF1+ea1OygclHiVAkPha70sfv o0C+emnWYUjsK5ejpDLTx63mW7bRQn/tfgsX4VoLf29PU3f =E5=9C=A8 2025/10/27 18:11, kernel test robot =E5=86=99=E9=81=93: >=20 >=20 > Hello, >=20 > kernel test robot noticed a 9.5% regression of postmark.transactions on: >=20 >=20 > commit: b7fdfd29a136a17c5c8ad9e9bbf89c48919c3d19 ("btrfs: only set the d= evice specific options after devices are opened") > https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git master >=20 >=20 > we are in fact not sure what's the connection between this change and th= e > postmark.transactions performance. still report out due to below checks. >=20 > [still regression on linus/master 4bb1f7e19c4a1d6eeb52b80acff5ac63e= dd1b91d] > [regression chould be solved by reverting this commit on linus/master he= ad] > [still regression on linux-next/master 72fb0170ef1f45addf726319c52a0562b= 6913707] >=20 > testcase: postmark > config: x86_64-rhel-9.4 > compiler: gcc-14 > test machine: 224 threads 4 sockets Intel(R) Xeon(R) Platinum 8380H CPU = @ 2.90GHz (Cooper Lake) with 192G memory > parameters: >=20 > disk: 1HDD > fs: btrfs > fs1: nfsv4 > number: 4000n > trans: 10000s > subdirs: 100d > cpufreq_governor: performance >=20 >=20 >=20 >=20 > If you fix the issue in a separate patch/commit (i.e. not just a new ver= sion of > the same patch/commit), kindly add following tags > | Reported-by: kernel test robot > | Closes: https://lore.kernel.org/oe-lkp/202510271449.efa21738-lkp@intel= .com >=20 >=20 > Details are as below: > ------------------------------------------------------------------------= =2D-------------------------> >=20 >=20 > The kernel config and materials to reproduce are available at: > https://download.01.org/0day-ci/archive/20251027/202510271449.efa21738-l= kp@intel.com >=20 > =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D > compiler/cpufreq_governor/disk/fs1/fs/kconfig/number/rootfs/subdirs/tbox= _group/testcase/trans: > gcc-14/performance/1HDD/nfsv4/btrfs/x86_64-rhel-9.4/4000n/debian-13-x= 86_64-20250902.cgz/100d/lkp-cpl-4sp2/postmark/10000s >=20 > commit: > 53a4acbfc1 ("btrfs: fix memory leak on duplicated memory in the qgrou= p assign ioctl") This is definitely not related. > b7fdfd29a1 ("btrfs: only set the device specific options after device= s are opened") But this may affect performance, because without this fix, btrfs always=20 falls back to `ssd` mount option Now it will properly detect rotating devices, and won't set `ssd` mount=20 option by default. But if this is causing performance drop, we should really consider if=20 `ssd` should be the only mode we support. Thanks, Qu >=20 > 53a4acbfc1de85fa b7fdfd29a136a17c5c8ad9e9bbf > ---------------- --------------------------- > %stddev %change %stddev > \ | \ > 2010 +10.5% 2222 nfsstat.Client.nfs.v4.ope= n_noat > 97983 =C2=B1 11% +18.5% 116101 numa-numastat.node1.= other_node > 97983 =C2=B1 11% +18.5% 116101 numa-vmstat.node1.nu= ma_other > 16001 =C2=B1 5% -7.5% 14797 =C2=B1 5% sched_debug.cfs= _rq:/.load.avg > 1474354 =C2=B1 3% +9.9% 1620281 =C2=B1 4% sched_debug.cpu= .avg_idle.avg > 756151 =C2=B1 3% +10.0% 831539 =C2=B1 4% sched_debug.cpu= .max_idle_balance_cost.avg > 3585 -2.6% 3490 perf-stat.i.context-switc= hes > 6141 =C2=B1 2% +4.0% 6385 perf-stat.i.cycles-b= etween-cache-misses > 5796 =C2=B1 2% +3.9% 6024 perf-stat.overall.cy= cles-between-cache-misses > 3580 -2.6% 3486 perf-stat.ps.context-swit= ches > 9.548e+11 +7.3% 1.025e+12 perf-stat.total.instructi= ons > 136494 +4.3% 142419 proc-vmstat.nr_inactive_f= ile > 136494 +4.3% 142419 proc-vmstat.nr_zone_inact= ive_file > 2784208 +4.8% 2917180 proc-vmstat.numa_hit > 2435763 +5.5% 2568673 proc-vmstat.numa_local > 3042276 +5.1% 3196281 proc-vmstat.pgalloc_norma= l > 2627503 +6.9% 2808220 proc-vmstat.pgfault > 2754381 +5.4% 2903034 proc-vmstat.pgfree > 97857 +6.3% 104058 proc-vmstat.pgreuse > 9.80 -9.4% 8.88 postmark.creation_mixed_t= rans > 112312 -7.0% 104473 postmark.data_read > 203502 -7.0% 189298 postmark.data_written > 9.80 -9.4% 8.88 postmark.deletion_mixed_t= rans > 9.73 -9.5% 8.80 postmark.files_appended > 12.59 -7.0% 11.70 postmark.files_created > 12.59 -7.0% 11.70 postmark.files_deleted > 9.87 -9.5% 8.93 postmark.files_read > 715.35 +7.5% 768.93 postmark.time.elapsed_tim= e > 715.35 +7.5% 768.93 postmark.time.elapsed_tim= e.max > 51508 -1.6% 50690 postmark.time.voluntary_c= ontext_switches > 19.61 -9.5% 17.75 postmark.transactions >=20 >=20 >=20 >=20 > Disclaimer: > Results have been estimated based on internal Intel analysis and are pro= vided > for informational purposes only. Any difference in system hardware or so= ftware > design or configuration may affect actual performance. >=20 >=20