From Bugzilla Helper: User-Agent: Mozilla/5.0 (X11; U; Linux 2.4.5 i686; en-US; rv:0.9) Gecko/20010507 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. How reproducible: Always 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). Additional info: 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 ftp://ftp.redhat.com/pub/redhat/linux/rawhide/SRPMS/SRPMS/kernel-*? 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
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