linux-kernel - Re: Linux 4.15-rc6

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Message-ID: <20180104110351.GC3235@1wt.eu>
Date:   Thu, 4 Jan 2018 12:03:51 +0100
From:   Willy Tarreau <w@....eu>
To:     Andres Freund <andres@...razel.de>
Cc:     Linus Torvalds <torvalds@...ux-foundation.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: Linux 4.15-rc6

On Thu, Jan 04, 2018 at 11:27:04AM +0100, Willy Tarreau wrote:
> > The post linked above has numbers with nopcid disabling pcid use, and
> > indeed, the difference is quite measurable.
> 
> I'm going to re-run the tests on an Atom C2518 now, which doesn't have pcid,
> I don't even know if it's affected by the issue.

FWIW the performance loss on the Atom is less important (probably in
part because other parts are slower and bottlenecks are spread in all
the hardware). I'm observing "only" 11-14% loss on the same tests.

Willy