On Wed, Feb 16, 2005 at 23:29:24 +0100, Droebbel wrote:
> On Mi, 2005-02-16 at 22:55 +0100, Droebbel wrote:
> >Some new information:
> >
> >2.6.7 is ok, 2.6.7-mm2 is not ok, 2.6.7 with just the linus-patch from
> >mm2 is ok, 2.6.7 with linus.patch from mm3 isn't.
> >So I took some of the patches from the broken-out mm2 and tested them
> >seperately.
> >
> >The vmscan-dont-reclaim-too-many-pages.patch led to the said reduction
> >of writing speed. I reverse-applied it to 2.6.8.1, where it seems to
> >solve the problem.
>
> Sorry, have to correct that: it seemed to help at my tests with dd
> (write 1G of zeroes to a file). Copying a file with mc still shows
> around 1.4MB/s. Could be worse, but is definitely not ok. It *is* better
> with 2.6.7.
Here are some numbers with my setup. I always wrote 1 GB of data to the
same DVD-RAM disc (EMTEC), to the device directly and to a fresh ext2
on
the disc.
kernel 2.6.10:
$ time { sudo dd if=/dev/zero of=bigfile bs=64k count=16000 ; sync ; }
real 32m5.025s
$ time {sudo dd if=/dev/zero of=/dev/cdrom bs=64k count=16000 ; sync ;}
real 29m41.980s
kernel 2.6.7:
$ time { sudo dd if=/dev/zero of=bigfile bs=64k count=16000 ; sync ; }
real 13m23.688s
$ time {sudo dd if=/dev/zero of=/dev/cdrom bs=64k count=16000 ; sync ;}
real 13m14.609s
Regards,
Tino
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