Messages in this thread | | | Date | Tue, 6 Apr 1999 15:09:47 +0200 (CEST) | From | Andrea Arcangeli <> | Subject | Re: [patch] arca-vm-2.2.5 |
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On Tue, 6 Apr 1999, Chuck Lever wrote:
>math. i'll post something about this soon.
Cool! thanks.
>i looked at doug's patch too, and it changes the "page_shift" value >depending on the size of the hash table. again, this *may* cause unwanted >interactions making the hash function degenerate for certain table sizes.
Agreed.
>ref: a stock 2.2.5 kernel > >p-al: a stock 2.2.5 kernel with your page struct alignment patch applied > >irq: a stock 2.2.5 kernel with your irq alignment patch applied > >both: a stock 2.2.5 kernel with both patches applied
*snip*
>ref: 4176.4 (s=27.45) > >p-al: 4207.9 (s=8.1) ^^^ it made _difference_ > >irq: 4228.8 (s=11.70) > >both: 4207.9 (s=13.34) ^^^^^ strange...
>the irq patch is a clear win over the reference kernel: it shows a
Good ;)
>consistent 1.25% improvement in overall throughput, and the performance >difference is more than a standard deviation. also, the variance appears >to be less with the irq kernel. i would bet on a more I/O bound load the >improvement would be even more stark. > >i'm not certain why the combination kernel performance was worse than the >irq-only kernel.
Hmm I'll think about that...
>"Lynch" is a PhD thesis available in postscript at Stanford's web site for >free. it's a study of different coloring methodologies, so it's fairly >broad.
Thanks!! I'll search for it soon.
Andrea Arcangeli
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