Messages in this thread | | | Date | Thu, 03 Feb 2011 13:58:08 -0800 | Subject | Re: Memset very slow | From | "Brian D. McGrew" <> |
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On 2/3/11 1:31 PM, "Alan Cox" <alan@lxorguk.ukuu.org.uk> wrote:
>> So, my question is, can someone explain to me what is going on here? I am >> not convinced this is a kernel problem just because a new kernel fixed it; >> but, if there were changes related to this in the kernel, then what is the >> oldest version I should be looking at to fix my issues? > > The newer kernel does several things that may be relevant - the obvious > one is that it rewrites and corrects MTRR data if it doesn't like what > the BIOS handed out. That would fit with dramatic slowdowns in memory > performance being fixed.
The Dell precsion-linux mailing list almost immediately pointed me here: https://bugzilla.redhat.com/show_bug.cgi?id=581933
Which seems like it is my problem and the fix seems to work for me.
-brian
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