From: Phil Turmel <philip@turmel.org>
To: Robert Kierski <rkierski@cray.com>,
Dallas Clement <dallas.a.clement@gmail.com>
Cc: "linux-raid@vger.kernel.org" <linux-raid@vger.kernel.org>
Subject: Re: RAID 5,6 sequential writing seems slower in newer kernels
Date: Wed, 2 Dec 2015 09:45:06 -0500 [thread overview]
Message-ID: <565F03F2.3070803@turmel.org> (raw)
In-Reply-To: <F7761B9B1D11B64BBB666019E9378117FDDB18@CFWEX01.americas.cray.com>
On 12/02/2015 09:18 AM, Robert Kierski wrote:
> Sorry... I should have mentioned that I'm running the 3.18.4 kernel
> with a 32 core xeon and 128G of memory. I'm not using a FS, I'm
> going directly to the raid block device.
I'm not sure if the parallelization of raid parity has been merged yet,
but I'm pretty sure it isn't in 3.18. With one core tied up computing
parity and the rest idle, that'd be 96.875% idle.
Phil
next prev parent reply other threads:[~2015-12-02 14:45 UTC|newest]
Thread overview: 35+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-12-01 23:02 RAID 5,6 sequential writing seems slower in newer kernels Dallas Clement
2015-12-02 1:07 ` keld
2015-12-02 14:18 ` Robert Kierski
2015-12-02 14:45 ` Phil Turmel [this message]
2015-12-02 15:28 ` Robert Kierski
2015-12-02 15:37 ` Phil Turmel
2015-12-02 15:44 ` Robert Kierski
2015-12-02 15:51 ` Phil Turmel
2015-12-02 19:50 ` Dallas Clement
2015-12-03 0:12 ` Dallas Clement
2015-12-03 2:18 ` Phil Turmel
2015-12-03 2:24 ` Dallas Clement
2015-12-03 2:33 ` Dallas Clement
2015-12-03 2:38 ` Phil Turmel
2015-12-03 2:51 ` Dallas Clement
2015-12-03 4:30 ` Phil Turmel
2015-12-03 4:49 ` Dallas Clement
2015-12-03 13:43 ` Robert Kierski
2015-12-03 14:37 ` Phil Turmel
2015-12-03 2:34 ` Phil Turmel
2015-12-03 14:19 ` Robert Kierski
2015-12-03 14:39 ` Dallas Clement
2015-12-03 15:04 ` Phil Turmel
2015-12-03 22:21 ` Weedy
2015-12-04 13:40 ` Robert Kierski
2015-12-04 16:08 ` Dallas Clement
2015-12-07 14:29 ` Robert Kierski
2015-12-08 19:38 ` Dallas Clement
2015-12-08 21:24 ` Robert Kierski
2015-12-04 18:51 ` Shaohua Li
2015-12-05 1:38 ` Dallas Clement
2015-12-07 14:18 ` Robert Kierski
2015-12-02 15:37 ` Robert Kierski
2015-12-02 5:22 ` Roman Mamedov
2015-12-02 14:15 ` Robert Kierski
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