From mboxrd@z Thu Jan  1 00:00:00 1970
From: Roman Mamedov <rm@romanrm.net>
Subject: Re: RAID 5,6 sequential writing seems slower in newer kernels
Date: Wed, 2 Dec 2015 10:22:37 +0500
Message-ID: <20151202102237.2adb17d4@natsu>
References: <CAE9DZURyZKmnUmnn5ELAhLUq8nhXD1eBx4g8hDmCzS-MYLrT+Q@mail.gmail.com>
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To: Dallas Clement <dallas.a.clement@gmail.com>
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On Tue, 1 Dec 2015 17:02:27 -0600
Dallas Clement <dallas.a.clement@gmail.com> wrote:

> I am frankly surprised at these results.  Perhaps there is some
> configuration or tunable settings that have changed since the 2.6
> kernel that I am unaware of that affect RAID 5, 6 performance.  Please
> comment if you have any ideas which might explain what I am seeing.

Do you use a write intent bitmap (internal?), what is your bitmap chunk siz=
e?

What is your stripe_cache_size set to?

--=20
With respect,
Roman

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