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 >>
WARNING: multiple messages have this Message-ID (diff)
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 >> _______________________________________________ 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: 40+ 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 23:22 ` Stefan Wahren 2022-05-21 23:46 ` Paul E. McKenney 2022-05-21 23:46 ` Paul E. McKenney 2022-05-22 15:11 ` Stefan Wahren 2022-05-22 15:11 ` Stefan Wahren 2022-05-23 4:48 ` Paul E. McKenney 2022-05-23 4:48 ` Paul E. McKenney 2022-05-23 6:19 ` Stefan Wahren 2022-05-23 6:19 ` Stefan Wahren 2022-05-23 9:29 ` Phil Elwell 2022-05-23 9:29 ` Phil Elwell 2022-05-23 10:48 ` Stefan Wahren 2022-05-23 10:48 ` Stefan Wahren 2022-05-23 11:01 ` Phil Elwell 2022-05-23 11:01 ` Phil Elwell 2022-05-23 11:15 ` Stefan Wahren 2022-05-23 11:15 ` Stefan Wahren 2022-05-23 11:22 ` Phil Elwell 2022-05-23 11:22 ` Phil Elwell 2022-05-23 7:09 ` Sebastian Andrzej Siewior 2022-05-23 7:09 ` Sebastian Andrzej Siewior 2022-05-25 13:56 ` Marcelo Tosatti 2022-05-25 13:56 ` Marcelo Tosatti 2022-05-25 14:07 ` Stefan Wahren 2022-05-25 14:07 ` Stefan Wahren 2022-05-25 14:26 ` Sebastian Andrzej Siewior 2022-05-25 14:26 ` Sebastian Andrzej Siewior 2022-05-25 15:02 ` Paul E. McKenney 2022-05-25 15:02 ` Paul E. McKenney 2022-05-25 15:37 ` Marcelo Tosatti 2022-05-25 15:37 ` Marcelo Tosatti 2022-05-29 22:47 ` Stefan Wahren [this message] 2022-05-29 22:47 ` Stefan Wahren 2022-05-30 9:54 ` Stefan Wahren 2022-05-30 9:54 ` Stefan Wahren 2022-06-01 21:02 ` Stefan Wahren 2022-05-23 9:28 ` Thorsten Leemhuis 2022-05-23 9:28 ` Thorsten Leemhuis 2022-07-04 9:48 ` Thorsten Leemhuis
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