Performance issue on dual Athlon MP
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I have a dual Athlon MP box (Tyan S2460 Tiger MP, 1.53 GHz, 2.5 GB Corsair PC2100). The initial installation was of SuSE 7.3, but I have upgraded to 2.4.17 with Andrea's 3.5 GB userspace patch.
Is this a known problem with 2.4.17 and/or the 3.5 GB userspace patch? I have not tried turning off the 3.5 GB config option (
CONFIG_05GB'). I do haveCONFIG_MK7' set.
The configuration I would try first on 2.4.19pre1aa1 with 2.5 GB of RAM is CONFIG_3GB=y and CONFIG_NOHIGHMEM=y. If that causes some other problem, I'd go with CONFIG_2GB, then finally CONFIG_1GB. Each config changes the user/kernel memory split. The loads I've run suggest for best performance:
CONFIG_2GB > CONFIG_1GB > CONFIG_05GB
On my 1GB box, I've been running CONFIG_2GB for a couple months and performance is great. Only lingering question for me is the handling of oom. Oom hasn't caused be a problem, but I haven't seen the oom killer do it's work when I create an oom condition.
BTW, Andrew Morton's read_latency2 patch is a winner. The read_latency2 diff I use on my 2.4.19pre1aa1 boxes is at:
http://home.earthlink.net/~rwhron/kernel/read_latency2-2.4.19pre1aa1.diff
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Randy Hron