From: Andrew Morton <akpm@linux-foundation.org>
To: dan@daniel-wynne-humphries.com
Cc: bugzilla-daemon@bugzilla.kernel.org, linux-mm@kvack.org,
Hugh Dickins <hughd@google.com>
Subject: Re: [Bug 198913] New: Swapping slows to about 20% of expected speed when using multiple swap partitions on separate drives (striping).
Date: Tue, 6 Mar 2018 16:23:46 -0800 [thread overview]
Message-ID: <20180306162346.2fad560fa6957480fde918e2@linux-foundation.org> (raw)
In-Reply-To: <bug-198913-27@https.bugzilla.kernel.org/>
(switched to email. Please respond via emailed reply-to-all, not via the
bugzilla web interface).
On Sat, 24 Feb 2018 03:56:38 +0000 bugzilla-daemon@bugzilla.kernel.org wrote:
> https://bugzilla.kernel.org/show_bug.cgi?id=198913
>
> Bug ID: 198913
> Summary: Swapping slows to about 20% of expected speed when
> using multiple swap partitions on separate drives
> (striping).
>
> ...
>
> Problems
> 1) Linux's swap striping on nine drives performs at only 19.5% of the speed of
> a memory-mapped file on a RAID 0 partition on the same nine drives.
> 2) Linux's swap striping performs best with exactly four swap partitions and
> performs almost as well with just three partitions.
>
Well that's interesting, thanks. Let's get this onto the mm
developers' mailing list and perhaps someone will have a theory. And
perhaps Hugh will have a think about it when he returns to the fold.
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next parent reply other threads:[~2018-03-07 0:23 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <bug-198913-27@https.bugzilla.kernel.org/>
2018-03-07 0:23 ` Andrew Morton [this message]
2018-03-07 0:57 ` Dan
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