Toot

Written by AndresFreundTec on 2024-08-10 at 17:03

@vbabka Repro it with fio without needing to reboot with clearcpuid=smap, that is.

io_uring's fixed buffers avoid the SMAP overhead:

numactl --physcpubind 5 --membind 0 \

fio --directory /srv/fio --size=8GiB --pre_read=1 --gtod_reduce=1 --filename read --invalidate=0 --rw read --buffered 1 --ioengine io_uring \

--name 1m-nofixed --bs=1M \

--name 1m-fixed --stonewall --fixedbufs --bs=1M \

--name 16m-nofixed --stonewall --bs=16M \

--name 16m-fixed --stonewall --fixedbufs --bs=16M

=> More informations about this toot | View the thread | More toots from AndresFreundTec@mastodon.social

Mentions

=> View vbabka@social.kernel.org profile

Tags