From: Stefan Wahren <stefan.wahren@i2se.com>
To: Marcelo Tosatti <mtosatti@redhat.com>,
Andrew Morton <akpm@linux-foundation.org>,
Nicolas Saenz Julienne <nsaenzju@redhat.com>
Cc: Borislav Petkov <bp@alien8.de>, Minchan Kim <minchan@kernel.org>,
Matthew Wilcox <willy@infradead.org>,
Mel Gorman <mgorman@techsingularity.net>,
Juri Lelli <juri.lelli@redhat.com>,
Thomas Gleixner <tglx@linutronix.de>,
Sebastian Andrzej Siewior <bigeasy@linutronix.de>,
"Paul E. McKenney" <paulmck@kernel.org>,
linux-kernel@vger.kernel.org, linux-mm@kvack.org,
Linux ARM <linux-arm-kernel@lists.infradead.org>,
Phil Elwell <phil@raspberrypi.com>,
regressions@lists.linux.dev
Subject: vchiq: Performance regression since 5.18-rc1
Date: Sun, 22 May 2022 01:22:00 +0200 [thread overview]
Message-ID: <77d6d498-7dd9-03eb-60f2-d7e682bb1b20@i2se.com> (raw)
Hi,
while testing the staging/vc04_services/interface/vchiq_arm driver with
my Raspberry Pi 3 B+ (multi_v7_defconfig) i noticed a huge performance
regression since [ff042f4a9b050895a42cae893cc01fa2ca81b95c] mm:
lru_cache_disable: replace work queue synchronization with synchronize_rcu
Usually i run "vchiq_test -f 1" to see the driver is still working [1].
Before commit:
real 0m1,500s
user 0m0,068s
sys 0m0,846s
After commit:
real 7m11,449s
user 0m2,049s
sys 0m0,023s
Best regards
[1] - https://github.com/raspberrypi/userland
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next reply other threads:[~2022-05-21 23:24 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-05-21 23:22 Stefan Wahren [this message]
2022-05-21 23:46 ` vchiq: Performance regression since 5.18-rc1 Paul E. McKenney
2022-05-22 15:11 ` Stefan Wahren
2022-05-23 4:48 ` Paul E. McKenney
2022-05-23 6:19 ` Stefan Wahren
2022-05-23 9:29 ` Phil Elwell
2022-05-23 10:48 ` Stefan Wahren
2022-05-23 11:01 ` Phil Elwell
2022-05-23 11:15 ` Stefan Wahren
2022-05-23 11:22 ` Phil Elwell
2022-05-23 7:09 ` Sebastian Andrzej Siewior
2022-05-25 13:56 ` Marcelo Tosatti
2022-05-25 14:07 ` Stefan Wahren
2022-05-25 14:26 ` Sebastian Andrzej Siewior
2022-05-25 15:02 ` Paul E. McKenney
2022-05-25 15:37 ` Marcelo Tosatti
2022-05-29 22:47 ` Stefan Wahren
2022-05-30 9:54 ` Stefan Wahren
2022-05-23 9:28 ` Thorsten Leemhuis
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