From: Peter Zijlstra <peterz@infradead.org>
To: Jon Maloy <jon.maloy@ericsson.com>
Cc: "netdev@vger.kernel.org" <netdev@vger.kernel.org>,
"mingo@kernel.org" <mingo@kernel.org>,
"David Miller (davem@davemloft.net)" <davem@davemloft.net>
Subject: Re: Serious performance degradation in Linux 4.15
Date: Sat, 10 Feb 2018 15:01:17 +0100 [thread overview]
Message-ID: <20180210140117.GP25201@hirez.programming.kicks-ass.net> (raw)
In-Reply-To: <BN6PR15MB1553DFF82A45A4E532B6DC119AF20@BN6PR15MB1553.namprd15.prod.outlook.com>
On Fri, Feb 09, 2018 at 05:59:12PM +0000, Jon Maloy wrote:
> The two commits
> d153b153446f7 (" sched/core: Fix wake_affine() performance regression") and
> f2cdd9cc6c97 ("sched/core: Address more wake_affine() regressions")
> are causing a serious performance degradation in Linux 4.5.
>
> The effect is worst on TIPC, but even TCP is affected, as the figures below show.
I did run a whole bunch of netperf and didn't see anything like that.
0-day also didn't report anything, and it too runs netperf.
I'll try and see if I can reproduce somewhere next week.
next prev parent reply other threads:[~2018-02-10 14:01 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-02-09 17:59 Serious performance degradation in Linux 4.15 Jon Maloy
2018-02-10 14:01 ` Peter Zijlstra [this message]
2018-02-12 15:16 ` Peter Zijlstra
2018-02-13 8:14 ` Jon Maloy
2018-02-14 22:46 ` Matt Fleming
2018-02-15 8:38 ` Peter Zijlstra
2018-02-16 10:09 ` Peter Zijlstra
2018-02-16 10:17 ` Peter Zijlstra
2018-02-16 10:49 ` Mel Gorman
2018-02-16 14:38 ` Matt Fleming
2018-02-16 16:48 ` Peter Zijlstra
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