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+Knpx9eYYzGWssX6bgkp7SdxsZPG9sfC0QyhNAvQL5/6lKcij8GJz+U7K7CI9OSD07LrHyD9WySXy+LZTBdgbkqlbdBOZSRpbMlTNVkWSZ8ON5Qz1S3Ut/jqGxBIB7nmVSN13k/r9/2myC0fvuNCOTN66dU7TXqFM6T/aMEGiamIVqdG+Pxz1az9tWp5rAVkdCp1poyH9ti3w1yCb4A2Ead2DrVOPZJo+YlS+Sn9HexW0lJEn3BzOewKu7M/ZxkN74AOAMyqEsGdMeQKxWXbFISZ1ou0uzi2p5GHR83f1IlHp9sbQhmSBddiyae8iu+rE9hoRLE4n9tjqFsPI57NWjkpfZ1cpf3sKScABcjF81NloSpcGjWCRX5uY9flEfJBXue5klIVTLktgKLmV50cvcZs79Q== X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 29-Nov-24 5:01 AM, Mateusz Guzik wrote: > On Thu, Nov 28, 2024 at 12:24 PM Bharata B Rao wrote: >> >> On 28-Nov-24 10:07 AM, Bharata B Rao wrote: >>> On 28-Nov-24 9:52 AM, Matthew Wilcox wrote: >>>> On Thu, Nov 28, 2024 at 09:31:50AM +0530, Bharata B Rao wrote: >>>>> However a point of concern is that FIO bandwidth comes down drastically >>>>> after the change. >>>>> >>>>> default inode_lock-fix >>>>> rw=30% >>>>> Instance 1 r=55.7GiB/s,w=23.9GiB/s r=9616MiB/s,w=4121MiB/s >>>>> Instance 2 r=38.5GiB/s,w=16.5GiB/s r=8482MiB/s,w=3635MiB/s >>>>> Instance 3 r=37.5GiB/s,w=16.1GiB/s r=8609MiB/s,w=3690MiB/s >>>>> Instance 4 r=37.4GiB/s,w=16.0GiB/s r=8486MiB/s,w=3637MiB/s >>>> >>>> Something this dramatic usually only happens when you enable a debugging >>>> option. Can you recheck that you're running both A and B with the same >>>> debugging options both compiled in, and enabled? >>> >>> It is the same kernel tree with and w/o Mateusz's inode_lock changes to >>> block/fops.c. I see the config remains same for both the builds. >>> >>> Let me get a run for both base and patched case w/o running perf lock >>> contention to check if that makes a difference. >> >> Without perf lock contention >> >> default inode_lock-fix >> rw=30% >> Instance 1 r=54.6GiB/s,w=23.4GiB/s r=11.4GiB/s,w=4992MiB/s >> Instance 2 r=52.7GiB/s,w=22.6GiB/s r=11.4GiB/s,w=4981MiB/s >> Instance 3 r=53.3GiB/s,w=22.8GiB/s r=12.7GiB/s,w=5575MiB/s >> Instance 4 r=37.7GiB/s,w=16.2GiB/s r=10.4GiB/s,w=4581MiB/s >> > > per my other e-mail can you follow willy's suggestion and increase the hash? With Mateusz's inode_lock fix and PAGE_WAIT_TABLE_BITS value of 10, 14, 16 and 20. (Two values given with each instance below are FIO READ bw and WRITE bw) 10 14 16 20 rw=30% Instance 1 11.3GiB/s 14.2GiB/s 14.8GiB/s 14.9GiB/s 4965MiB/s 6225MiB/s 6487MiB/s 6552MiB/s Instance 2 12.3GiB/s 10.4GiB/s 10.9GiB/s 11.0GiB/s 5389MiB/s 4548MiB/s 4770MiB/s 4815MiB/s Instance 3 11.1GiB/s 12.3GiB/s 11.2GiB/s 13.5GiB/s 4864MiB/s 5410MiB/s 4923MiB/s 5927MiB/s Instance 4 12.3GiB/s 13.7GiB/s 13.0GiB/s 11.4GiB/s 5404MiB/s 6004MiB/s 5689MiB/s 5007MiB/s Number of hash buckets don't seem to matter all that much in this case. Regards, Bharata.