Re: [PATCH] lib: memcmp optimization

2018-10-10 Thread Jinpu Wang
On Wed, Oct 10, 2018 at 1:13 AM Andrew Morton wrote: > > On Tue, 9 Oct 2018 16:28:11 +0200 Jack Wang wrote: > > > From: Florian-Ewald Mueller > > > > During testing, I have configured 128 md/raid1's and, while under > > heavy IO, I started a check on each of them > > (echo check > /sys/block/md

Re: [PATCH] lib: memcmp optimization

2018-10-09 Thread Andrew Morton
On Tue, 9 Oct 2018 16:28:11 +0200 Jack Wang wrote: > From: Florian-Ewald Mueller > > During testing, I have configured 128 md/raid1's and, while under > heavy IO, I started a check on each of them > (echo check > /sys/block/mdx/md/sync_action). > > The CPU utilization went through the ceiling

[PATCH] lib: memcmp optimization

2018-10-09 Thread Jack Wang
From: Florian-Ewald Mueller During testing, I have configured 128 md/raid1's and, while under heavy IO, I started a check on each of them (echo check > /sys/block/mdx/md/sync_action). The CPU utilization went through the ceiling and when looking for the cause (with 'perf top'). I've discovered t