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On Sun, 31 Dec 2000, Matti Aarnio wrote: > On Sun, Dec 31, 2000 at 10:42:26AM +0100, Mike Galbraith wrote: > > Hi, > > > > While running iozone, I notice severe stalls of vmstat output > > despite vmstat running SCHED_RR and mlockall(). > > Lets eliminate the obvious: > > - Are you running with IDE disk ? Yes. > - Does hdparm /dev/hda(whatever) report: > > /dev/hda: > unmaskirq = 0 (off) > using_dma = 0 (off) No. /dev/hda: multcount = 0 (off) I/O support = 1 (32-bit) unmaskirq = 1 (on) using_dma = 1 (on) keepsettings = 1 (on) nowerr = 0 (off) readonly = 0 (off) readahead = 8 (on) geometry = 2482/255/63, sectors = 39876480, start = 0 > > The IKD uses local interrupts, so this isn't necessarily true... I just did a (mondo) trace covering 8 seconds of kernel time, and vmstat ran twice. (Those two times were before I noticed the stall and started counting down toward 'poke the freeze-frame button') -Mike - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org Please read the FAQ at http://www.tux.org/lkml/ | ||||||||||||
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