From: Stefan Wahren <stefan.wahren@i2se.com>
To: Marcelo Tosatti <mtosatti@redhat.com>
Cc: Sebastian Andrzej Siewior <bigeasy@linutronix.de>,
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: Mon, 30 May 2022 00:47:04 +0200 [thread overview]
Message-ID: <bd8d4306-293e-6755-2f43-c027533d1ff2@i2se.com> (raw)
In-Reply-To: <Yo5NQS470wTuDq/f@fuller.cnet>
Am 25.05.22 um 17:37 schrieb Marcelo Tosatti:
> On Wed, May 25, 2022 at 04:07:47PM +0200, Stefan Wahren wrote:
>> 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.
> To clarify: they are not the same patches.
Thanks for pointing out. I will test it ASAP.
>
>> 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
>>
next prev parent reply other threads:[~2022-05-29 22:47 UTC|newest]
Thread overview: 21+ 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
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 [this message]
2022-05-30 9:54 ` Stefan Wahren
2022-06-01 21:02 ` Stefan Wahren
2022-05-23 9:28 ` Thorsten Leemhuis
2022-07-04 9:48 ` Thorsten Leemhuis
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