From: Peter Zijlstra <peterz@infradead.org>
To: Matt Fleming <matt@codeblueprint.co.uk>
Cc: Jon Maloy <jon.maloy@ericsson.com>,
"netdev@vger.kernel.org" <netdev@vger.kernel.org>,
"mingo@kernel.org" <mingo@kernel.org>,
"David Miller (davem@davemloft.net)" <davem@davemloft.net>,
Mike Galbraith <umgwanakikbuti@gmail.com>
Subject: Re: Serious performance degradation in Linux 4.15
Date: Fri, 16 Feb 2018 17:48:53 +0100 [thread overview]
Message-ID: <20180216164853.GG25201@hirez.programming.kicks-ass.net> (raw)
In-Reply-To: <20180216143839.GA3203@codeblueprint.co.uk>
On Fri, Feb 16, 2018 at 02:38:39PM +0000, Matt Fleming wrote:
> On Wed, 14 Feb, at 10:46:20PM, Matt Fleming wrote:
> > Here's some more numbers. This is with RETPOLINE=y but you'll see it
> > doesn't make much of a difference. Oh, this is also with powersave
> > cpufreq governor.
>
> Feh, I was wrong. The differences in performance I see are entirely
> due to CONFIG_RETPOLINE and CONFIG_PAGE_TABLE_ISOLATION being enabled.
OK, so I'm not the one crazy person not being able to reproduce this :-)
Lets wait for more details from the original submitter.
prev parent reply other threads:[~2018-02-16 16:49 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
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 [this message]
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