Re: WriteThrough pageclearing, 2.1.50, anyone with a PPro?

Ingo Molnar (mingo@pc7537.hil.siemens.at)
Sat, 16 Aug 1997 12:17:26 +0200 (MET DST)


> could someone with a PPro give this patch a try? [...]

thanks to Manuel J. Galan who tested the patch and found that if we do
WriteThrough caching for page-clearing, we loose alot of performance:

> I have a PPro 200 SMP (two proccessors) and the results of kernel
> compilation (_not_ in parallel mode)
>
> ------------------------------------------------------
> root@mgmux(26)[~/linux]# cat time_before_patch
> real 7m1.107s
> user 6m6.270s
> sys 0m41.130s
> root@mgmux(27)[~/linux]# cat time_after_patch
> real 8m28.277s
> user 6m5.400s
> sys 2m18.470s
> ------------------------------------------------------
>
> results seem consistent (ie. repeated three times) ;-(

seems like the PPro string implementation for WB caching type is extremely
effective, so we want to keep the current implementation :)

-- mingo