linux-kernel - Re: [REGRESSION] ioprio performance hangs, bisected

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Message-Id: <20241130060949.122381-1-00107082@163.com>
Date: Sat, 30 Nov 2024 14:09:49 +0800
From: David Wang <00107082@....com>
To: chris.bainbridge@...il.com
Cc: axboe@...nel.dk,
	bvanassche@....org,
	hch@....de,
	linux-block@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	regressions@...ts.linux.dev,
	semen.protsenko@...aro.org
Subject: Re: [REGRESSION] ioprio performance hangs, bisected

Would fix/revert reach 6.13-rc1? I think this regression has
significant nagative impact on daily usage. From time to time,
my system would *stuck* for seconds, sometimes even when
 just `cat` some small file it would take seconds, and once,
my desktop failed to resume from a suspend, I had to power cycle the system;
Polling /proc/diskstats,  I noticed Block-IO read latency,
delta(# of milliseconds spent reading)/delta(# of reads completed),
is very high, ~200ms average, and frequently reaches 10s.
 (Strangely block-io write latency seems normal.)
My bisect also land on this commit, revert or apply this patch would
fix it.

Kind of think that 6.13-rc1 would be very unpleseant to use without
a fix/revert for this.

David