On Fri, Dec 12, 2008 at 12:15 AM, Bart Van Assche <bart.vanassche@xxxxxxxxx> wrote: > > On Fri, Dec 12, 2008 at 5:55 AM, Eric D. Mudama <edmudama@xxxxxxxxx> wrote: > > On 12/11/08, Eric D. Mudama <edmudama@xxxxxxxxx> wrote: > >> Out of curiosity, is write cache enabled or disabled on these devices? > > > > Oops, I just noticed the oflag=direct, that can have a huge > > performance difference depending on the block size. > > > > What numbers are you getting without oflag=direct? > > IMHO repeating the measurements without oflag=direct does not make > sense: measurements with oflag=direct tell something about the > performance of the SSD and the software layers on top of it. Without > oflag=direct writes are buffered by Linux and data is written > asynchronously to the SSD. Oops, I guess I assumed that by writing a few gigabytes of data it wouldn't matter that much. I'll run the test again in a bit once I'm off this solaris machine. -- 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
