Hi all, this is the first step towards a new FC error handler. This patch implements a new FC command timeout handler which will be sending command aborts inline without engaging SCSI EH.
In addition the commands will be returned directly if the command abort succeeded, cutting down recovery times dramatically. With the original scsi error recovery I got: # time dd if=/dev/zero of=/mnt/test.blk bs=512 count=2048 oflag=sync 2048+0 records in 2048+0 records out 1048576 bytes (1.0 MB) copied, 3.72732 s, 281 kB/s real 2m14.475s user 0m0.000s sys 0m0.104s with this patchset I got: # time dd if=/dev/zero of=/mnt/test.blk bs=512 count=2048 oflag=sync 2048+0 records in 2048+0 records out 1048576 bytes (1.0 MB) copied, 79.6376 s, 13.2 kB/s real 1m19.642s user 0m0.000s sys 0m0.100s Test was to disable RSCN on the target port, disable the target port, and then start the 'dd' command as indicated. Comments etc are welcome. Hannes Reinecke (4): scsi: move initialization of scmd->eh_entry blk-timeout: add BLK_EH_SCHEDULED return code scsi: export functions for new fc timeout handler scsi_transport_fc: FC timeout handler drivers/scsi/scsi_error.c | 8 ++++- drivers/scsi/scsi_lib.c | 6 ++-- drivers/scsi/scsi_priv.h | 2 ++ drivers/scsi/scsi_transport_fc.c | 63 +++++++++++++++++++++++++++++++++++++++- include/linux/blkdev.h | 1 + include/scsi/scsi_transport_fc.h | 2 ++ 6 files changed, 78 insertions(+), 4 deletions(-) -- 1.7.12.4 -- To unsubscribe from this list: send the line "unsubscribe linux-scsi" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
