Red Hat Bugzilla – Bug 50195
Severely Slow Performance on Quad Xeon w/ 8 gig ram on all 2.4.x kernels.
Last modified: 2005-10-31 17:00:50 EST
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User-Agent: Mozilla/5.0 (X11; U; Linux 2.4.5 i686; en-US; rv:0.9)
Description of problem:
In performance testing, the 2.4.x kernels have significant performance
difficulties in processor intensive tasks. The 2.2.19 enterprise kernel
operates perfectly well (despite limitations in seeing the available RAM).
The performance slowdown is horrendous, compiling a 2.2.x kernel drops
from 3 minutes (on 2.2.19-e), to over 2 hours using the 2.4 kernel. Boot
up is slowed, all I/O on affected box is essentially crippled. Clean
updated install from 7.1 reproduces problem. Clean updated 6.2 install w/
2.4.x kernels reproduces problem. Clean updated 7.0 install w/ 2.4.x
reproduces problem. Tried all kernels 2.4.x.
Steps to Reproduce:
1.Install Redhat Linux on SuperMicro S@QE6
2.Run a 2.4.x Kernel.
3.Attempt to Operate Box.
Actual Results: Performance is significantly affected w/ 2.4 kernels.
Expected Results: The 2.4.x kernels, with all the enterprise updates,
should have happily seen the 8 gigs of Ram, robustly crunched data with the
pair of install p3-xeon w/ 2mb cache and generally have been a kick ass
Oracle Box, without a trace of the 1.4 gig shhmax issue that I am having
with the 2.2.19 kernel (grin).
Please go to www.speakeasy.net/~danny/2.4.x.bug.hardware.output.txt and
look at the dmesg for exact information on the hardware in the box. It is
a SuperMicro S2QE6, w/ 2 Xeon 700/2MB (2 empty slots filled w/ appropriate
terminator.) 8 gigs of Ram in 4 interleaved memory bands, booting off an
adaptec 7899 U160 on an IBM DYS-T18350M,w/ another DYS-T18350M for logs,
and the Oracle partitions are on an ICP Vortex GDT8543RZ 64 bit/66mhz raid
controller, with 8 IBM DYS-T18350M, running 0+1 drive array. Really looks
like a severe driver bug, no idea what in particular.
Can you please try a current kernel from
The gdth driver is updated to version 2.0 and I'd be interested
to know if this fixes your problems.
Thanks a lot,
Florian La Roche
Closed: no reply in over a year