linux-kernel - Re: 6.10/regression/bisected - after f1d97e769152 I spotted increased execution time of the kswapd0 process and symptoms as if there is not enough memory

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Message-ID: <277314c9-c4aa-4966-9fbe-c5c42feed7ef@gmail.com>
Date: Sun, 11 Aug 2024 10:08:59 +0200
From: Jannik Glückert <jannik.glueckert@...il.com>
To: fdmanana@...nel.org
Cc: andrea.gelmini@...il.com, dsterba@...e.com, josef@...icpanda.com,
 linux-btrfs@...r.kernel.org, linux-kernel@...r.kernel.org,
 mikhail.v.gavrilov@...il.com, regressions@...ts.linux.dev
Subject: Re: 6.10/regression/bisected - after f1d97e769152 I spotted increased
 execution time of the kswapd0 process and symptoms as if there is not enough
 memory

Hello,

I am still encountering this issue on 6.10.3. As far as I can see this 
is the last post in the thread, if the discussion continued elsewhere 
please let me know.

My workload is a backup via restic, the system is idle otherwise.
This is on a Zen4 CPU with a very fast PCIe Gen4 nvme, so perhaps it was 
fixed for others because they had comparatively slow IO or a smaller 
workload?

I have attached the bpftrace run and a graph of the memory PSI. kswapd0 
is at 100% during the critical sections. dmesg is empty.
Important events were e.g. 09:31-09:32 and 09:33-09:34 where the system 
was completely unresponsive multiple times, for about 5 seconds at a time.

I did also mention this on the #btrfs IRC channel and there are other 
users still encountering this on 6.10

Best
Jannik

Download attachment "psi_memory.jpg" of type "image/jpeg" (297648 bytes)

Download attachment "bpftrace.log.gz" of type "application/gzip" (178863 bytes)