Messages in this thread | | | Date | Tue, 11 Apr 2006 20:43:12 +0200 (MEST) | From | Jan Engelhardt <> | Subject | Re: 40% IDE performance regression going from FC3 to FC5 with same kernel |
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>> > 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 -- - 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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