>> > I'll be filing a FC5 performance bug for this but would like an opinion
>> > from the IDE kernel people just in case this has already been seen...
>> >
>> > I just upgraded my home K7-800, 512MB RAM box from FC3 to FC5
>> > and noticed a disk performance slowdown while copying files around.
>>
>> Just another suggestion: try eliminating/pinpointing I/O scheduler issues
>> (switch e.g. to "noop" at /sys/block/hda/queue/scheduler and compare again)
>
>Thanks Andi. Tried every scheduler (my default is anticipatory) and
> there aren't meaningful differences - 18.3 to 18.6MB/s.
>
>As a further data point, my box can burn a 8x DVD+R at up to 7.1x
> average speed under FC3, while it barely keeps up with 4x in FC5.
Since you said it happens with the same kernel, I think it's caused by
userspace (do the boot-with-"-b" thing and you'll know). Possible someone
setting DMA to speeds as low as udma4 or udma2.
Jan Engelhardt
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