Bug 82372 - (SCSI AACRAID NFS)SLOW NFS or I/O performance with 2.4.18
(SCSI AACRAID NFS)SLOW NFS or I/O performance with 2.4.18
Product: Red Hat Linux
Classification: Retired
Component: kernel (Show other bugs)
i686 Linux
medium Severity medium
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Assigned To: Steve Dickson
Brian Brock
Depends On:
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Reported: 2003-01-21 13:28 EST by brien fwd
Modified: 2007-04-18 12:50 EDT (History)
1 user (show)

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Fixed In Version:
Doc Type: Bug Fix
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Last Closed: 2003-12-16 21:21:52 EST
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RHEL 7.3 requirements from Atomic Host:
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Description brien fwd 2003-01-21 13:28:25 EST
From Bugzilla Helper:
User-Agent: Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; Q312461; .NET 
CLR 1.0.3705; .NET CLR 1.1.4322)

Description of problem:
have been running the 2.2.x series and then the 2.4.9 series kernels for a long 
time with no performance issues.  i then upgraded to 2.4.18-19.7.xsmp and saw a 
very large drop in i/o performance.

i am running a single server (nfs and imap) with multiple nfs clients.  the 
server seems to be choking on disk i/o.

the server is a dell poweredge 2450 (with perc 3/si raid 1+0 using the aacraid 
driver), 2x733Mhz PIII, 2GB RAM.

i'm running the ext3 filesystem and most mounts use the "noatime" option.

where there significant changes to NFS, aacraid, or file caching going from 
2.4.9 to 2.4.18?

any tips for troubleshooting this?

Version-Release number of selected component (if applicable):

How reproducible:

Steps to Reproduce:
1.see above

Additional info:
Comment 1 Alan Cox 2003-06-08 11:20:41 EDT
Is this still the case with the current errata ?

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