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Subjectaverage user comments on 2.5.1-pre5
I've just tried running 2.5.1-pre5 on my desktop machine and
noticed the following, when untarring medium sized files (kernel tarballs)
even from disk to disk (different channels) or moving large files around i
get mouse lag in X and after its done, and the flushing to disk begins the
interactive performance of the box takes a dive for the duration of that
disk activity. The last kernel i had before this was 2.4.13-ac7-preempt
which didn't exhibit this. 2.5.1-pre1 has the same problem.

The box is a P3-550/512M with disks doing UDMA33 on a PIIX4, the source
filesystem (where the tarballs are) is an ext3 one and destination is
ReiserFS (different disks/channels). The lag doesn't seem attributed to
CPU usage because the disk i/o barely hits the CPU (also checked via
xosview). VM performance on the other hand is quite nice, it does the
right thing a good majority of the time (unused stuff getting paged out,
proper cache/buffer usage) Main memory usage is a mixture of large
datasets and disk cache (multiple 500+ page PDFs being searched, whilst
doing various background compiles).

Zwane Mwaikambo

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