On 7/4/05, Al Boldi <[EMAIL PROTECTED]> wrote: > Bartlomiej Zolnierkiewicz wrote: { > > > > > >>On 7/4/05, Al Boldi <[EMAIL PROTECTED]> wrote: > > >>Hdparm -tT gives 38mb/s in 2.4.31 > > >>Cat /dev/hda > /dev/null gives 2% user 33% sys 65% idle > > >> > > >>Hdparm -tT gives 28mb/s in 2.6.12 > > >>Cat /dev/hda > /dev/null gives 2% user 25% sys 0% idle 73% IOWAIT > > >> > > >>It feels like DMA is not being applied properly in 2.6.12. > > > > > > Same on 2.6.10,11,12. > > > No errors though, only sluggish system. > > What about earlier kernels? > Please try to narrow down the problem to a specific kernel version. > } > > Don't know about 2.6.0-2.6.9, but 2.4.31 is ok.
2.4 -> 2.6 means zillions of changes. > Bartlomiej, > When you compare 2.4.31 with 2.6.12 don't you see this problem on your > machine? Unfortunately I've never encountered this problem on any machine. > If you have a fast system the slowdown won't show, but your IOWAIT will be > higher anyway! AFAIK high iowait is a known block layer problem > It feels like running on PIO instead of DMA. - To unsubscribe from this list: send the line "unsubscribe linux-ide" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html