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From: Stefan Wahren <stefan.wahren@i2se.com>
To: Marcelo Tosatti <mtosatti@redhat.com>,
	Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Cc: Andrew Morton <akpm@linux-foundation.org>,
	Nicolas Saenz Julienne <nsaenzju@redhat.com>,
	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>,
	"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: Re: vchiq: Performance regression since 5.18-rc1
Date: Wed, 25 May 2022 16:07:47 +0200	[thread overview]
Message-ID: <e0402350-687e-14b6-2e30-4b459afa9afb@i2se.com> (raw)
In-Reply-To: <Yo41ggMvkI1B9TeM@fuller.cnet>

Hi Marcelo,

Am 25.05.22 um 15:56 schrieb Marcelo Tosatti:
> On Mon, May 23, 2022 at 09:09:07AM +0200, Sebastian Andrzej Siewior wrote:
>> On 2022-05-22 01:22:00 [+0200], Stefan Wahren wrote:
>>> Hi,
>> 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].
>> What about
>> 	https://lore.kernel.org/all/YmrWK%2FKoU1zrAxPI@fuller.cnet/
>>
>> Sebastian
> Stefan,
>
> Can you please try the patch above ?

this was the same as Paul send. I think i need more time for 
investigation, maybe there is an issue with the application.

All i noticed so far is that in good case the CPU usage is around ~ 60 % 
and higher, while in bad case the CPU is almost idle. Also the issue is 
not reproducible with arm64/defconfig.

>
>
>
> _______________________________________________
> linux-arm-kernel mailing list
> linux-arm-kernel@lists.infradead.org
> http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

  reply	other threads:[~2022-05-25 14:08 UTC|newest]

Thread overview: 19+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-05-21 23:22 vchiq: Performance regression since 5.18-rc1 Stefan Wahren
2022-05-21 23:46 ` 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 [this message]
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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