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June 2011

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Subject:
SL6 kernels and st buffer allocation failure
From:
Gerhard Schneider <[log in to unmask]>
Reply To:
Gerhard Schneider <[log in to unmask]>
Date:
Sat, 25 Jun 2011 08:51:29 +0200
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When switching from SL5 to SL6 we discovered a problem in st kernel
buffer allocation.

When the machine is under high memory load and the st tape driver tries
to allocate the tape buffer it fails with:

st0: Can't allocate 2097152 byte tape buffer.
Only possibility to cure is a reboot of the machine.

Reverting back to SL5 removes the problem.

Affected hardware: LTO-3 and LTO-5 libraries with different LSILogic
Megaraid SAS and SCSI HBAs.

The problem has been discussed (and perhaps solved) in the Linux-SCSI
mailing list but the fix didn't make it into the 6.x kernels of the
upstream provider.

http://kerneltrap.org/mailarchive/linux-scsi/2010/11/28/6887564

How to push that to RedHat?

Gerhard Schneider

-- 
Gerhard Schneider
Institute of Lightweight Design and         e-Mail: [log in to unmask]
Structural Biomechanics (E317)                 Tel.: +43 664 60 588 3171
Vienna University of Technology / Austria      Fax:    +43 1 58801 31799
A-1040 Wien, Gusshausstrasse 27-29     http://www.ilsb.tuwien.ac.at/~gs/

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