Date: Tue, 3 Dec 2002 16:24:17 -0500 (EST)
From: Steinar Hauan <hauan@cmu.edu>
To: linux-kernel@vger.kernel.org
Subject: 2.4.20 raid performance
Message-ID: <Pine.LNX.4.44L-027.0212031614350.21735-100000@unix46.andrew.cmu.edu>
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hello,

  we have a database server (dual p4 xeon, E7500 chipset) with an Adaptec
  AIC-7899 RAID-0 controller vs Seagate Cheetah 15k rpm disks.

  using a custom 2.4.20 kernel and hdparm, we only get a sustained write
  speed of approx 60mb/s  ... versus more than 100 on a RedHat rpm kernel.
  (2.4.18 and later) with no change in raid configuration.

  does anyone know if RedHat have modified the raid setup in their kernels
  or if there are specific options in the kernel config that could lead
  to the above performance degradation?

  any pointers would be appreciated. kernel config file available
  on http://steinar.cheme.cmu.edu/config.p4-2.4.20 for one week.

regards,
--
  Steinar Hauan, dept of ChemE  --  hauan@cmu.edu
  Carnegie Mellon University, Pittsburgh PA, USA

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