Hi Calin,
> 2.5.47 with copy user patch
>
> /dev/hda:
> Timing buffer-cache reads: 128 MB in 0.71 seconds =180.28 MB/sec
> Timing buffered disk reads: 64 MB in 4.06 seconds = 15.78 MB/sec
>
>
> vanila 2.5.47
>
> /dev/hda:
> Timing buffer-cache reads: 128 MB in 1.09 seconds =117.32 MB/sec
> Timing buffered disk reads: 64 MB in 4.05 seconds = 15.78 MB/sec
Thank you for trying,
I also been using for compiling kernel for several days,
but, as Andi mentioned, currently the aki_copy is *dangerous*
when any processes/threads ara using fpu register.
I read the code of laze FPU state saving and confirmed that
if the function does not generate exception than
'kernel_fpu_begin/end()' should assure fpu safe inside kernel.
However, it is not enough where exception could rise, as Takahashi
mentioned.
I also have benchmark for small buffer which is enough to fit in cache
which I would like to show that aki_copy does perform well for this
circumstances.
But I have something urgent todo(homework :)) and I will come back to it
as soon as possible.
Thank you,
Akira Tsukamoto
On Tue, 19 Nov 2002 18:34:16 +0100 (CET)
szonyi calin <caszonyi@yahoo.com> mentioned:
> Hello everybody
>
> I patched yesterday the 2.5.47 vanilla kernel with Akira
> Tsukamoto's Athlon copy_user patch and tried a
> hdparm -tT /dev/hda
>
> The results (atached) are impressive compared with both the
> vanilla 2.5.47 kernel and the 2.4.19 with ck-rl5 patches (from
> colivas)
>
> Bye
>
> Calin
>
>
>
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-- Akira Tsukamoto <akira-t@suna-asobi.com, at541@columbia.edu>- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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