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LvAUudZpNEedA8ePjNKTaRMSUnbrdvxrSMxXxdC2e9tqNq4pPPAHP7fwtzyXeJc4WFmwfQIItHS lDV09EVkdmqJMBQ3NBehhvxGzI/cjF7JRodwqkQW96kiHQLLBChs9IUvg80PbfTNT/2JGQVBPEP eevsUTSaVP1/Sg/5/RQ== On 21/08/2026 06:11, Christoph Hellwig wrote: > scsi_debug by defaults delays I/O Maybe we can just make delay=0 default for that driver. Or use ndelay > 0. > and doesn't support multi-page I/O. > Flipping these defaults speed up each test using scsi_debug by more than > an order of magnitute on my test systems. > > Signed-off-by: Christoph Hellwig FWIW: Reviewed-by: John Garry > --- > common/scsi_debug | 16 +++++++++++++--- > 1 file changed, 13 insertions(+), 3 deletions(-) > > diff --git a/common/scsi_debug b/common/scsi_debug > index c3fe7be623fa..af51905dc4ba 100644 > --- a/common/scsi_debug > +++ b/common/scsi_debug > @@ -59,9 +59,19 @@ _get_scsi_debug_dev() > let physical=physical/2 > let phys_exp=phys_exp+1 > done > - opts="sector_size=$logical physblk_exp=$phys_exp lowest_aligned=$unaligned dev_size_mb=$size $@" > - echo "scsi_debug options $opts" >> $seqres.full > - modprobe scsi_debug $opts > + > + local opts=( > + "sector_size=$logical" > + "physblk_exp=$phys_exp" > + "lowest_aligned=$unaligned" > + "dev_size_mb=$size" > + "delay=0" > + "clustering=1" > + ) > + opts+=("$@") > + > + echo "scsi_debug options ${opts[*]}" >> $seqres.full > + modprobe scsi_debug "${opts[@]}" > [ $? -eq 0 ] || _fail "scsi_debug modprobe failed" > $UDEV_SETTLE_PROG > device=`grep -wl scsi_debug /sys/block/sd*/device/model | awk -F / '{print $4}'`