On Mon, 2011-08-22 at 21:07 +0000, bugzilla-daemon@xxxxxxxxxxxxxxxxxxx wrote: > We were using the default CFQ scheduler. I will change it to deadline and see > what happens. Also, we are not using a file system to perform the writes, > rather we are sending SCSI commands directly to the devices, nor are we doing > anything special to the disks with a device mapper. We simply write to each > one on a different thread one sector at a time. > > I will attempt to get the trace and will add it if I can. If you're just using a SG_IO type scsi command, then virtually nothing we've done in block/scsi should affect this; certainly not the elevators since we don't do merging on SG_IO, we just use them for queueing. Since you say "write to each one on a different thread", it's possible that some scheduler change may have impacted this. James -- 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
