linux-kernel - Re: vchiq: Performance regression since 5.18-rc1

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Message-ID: <Yo41ggMvkI1B9TeM@fuller.cnet>
Date:   Wed, 25 May 2022 10:56:18 -0300
From:   Marcelo Tosatti <mtosatti@...hat.com>
To:     Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        Stefan Wahren <stefan.wahren@...e.com>
Cc:     Stefan Wahren <stefan.wahren@...e.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Nicolas Saenz Julienne <nsaenzju@...hat.com>,
        Borislav Petkov <bp@...en8.de>,
        Minchan Kim <minchan@...nel.org>,
        Matthew Wilcox <willy@...radead.org>,
        Mel Gorman <mgorman@...hsingularity.net>,
        Juri Lelli <juri.lelli@...hat.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        "Paul E. McKenney" <paulmck@...nel.org>,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        Phil Elwell <phil@...pberrypi.com>, regressions@...ts.linux.dev
Subject: Re: vchiq: Performance regression since 5.18-rc1

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 ?