On Sun, May 25, 2014 at 09:43:36PM +0900, Akinobu Mita wrote: > This change enables to test read/write commands with huge transfer > length such as 1GB. For example: > > # modprobe scsi_debug dev_size_mb=1024 clustering=1 opts=1 > # cat /sys/block/$DEV/queue/max_hw_sectors_kb > \ > /sys/block/$DEV/queue/max_sectors_kb > # fio --name=test --rw=write --bs=1g --size=1g --filename=/dev/$DEV \ > --mem=mmaphuge --direct=1 > > The data type of max_sectors in scsi_host_template has been extended > to unsigned int by the previous change. So we can increase it from > 0xffff to 0xffffffff to allow such huge transfer length. > > Also, this increases sg_tablesize and max_segment_size, otherwise the > maximum transfer length is limited to 64MB. > (sg_tablesize * max_segment_size = 256 * 256KB) > > Signed-off-by: Akinobu Mita <akinobu.mita@xxxxxxxxx> Looks good, Reviewed-by: Christoph Hellwig <hch@xxxxxx> -- To unsubscribe from this list: send the line "unsubscribe linux-scsi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
