On 14-06-02 09:56 AM, 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> Reviewed-by: Christoph Hellwig <hch@xxxxxx> Cc: Christoph Hellwig <hch@xxxxxx> Cc: Jens Axboe <axboe@xxxxxxxxx> Cc: "James E.J. Bottomley" <JBottomley@xxxxxxxxxxxxx> Cc: Douglas Gilbert <dgilbert@xxxxxxxxxxxx> Cc: linux-scsi@xxxxxxxxxxxxxxx
Acked by: Douglas Gilbert <dgilbert@xxxxxxxxxxxx> -- 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
