https://bugzilla.kernel.org/show_bug.cgi?id=42939 --- Comment #1 from Mark <bugzilla-kernel-org-sux2k0@xxxxxxxxx> 2012-03-19 19:33:29 --- Additional information: trying to disable the writecache leads to the partition on the SCSI device getting remounted read-only due to device errors. Additional information (2): I get 5.000 to 6.000 random reads per second even when manually creating the fiometer file using random data from /dev/urandom (ie. fio doesn't access zeroes in that case). Additional information (3): The host doesn't seem to cache anything: "dd iflag=direct if=/dev/sda bs=1M of=/dev/null count=10" always and repeatedly gives me around 30-60 MB/s. Additional information (4): I did a simple MySQL InnoDB ACID transaction test where subsequent transactions are done via a remote mysql client as fast as possible. I crashed the host hardware and checked if all transactions reported as completed had been committed to disk: no obvious problems there -- seemingly the reported writecache has no writecache-effects at all...?? -- Configure bugmail: https://bugzilla.kernel.org/userprefs.cgi?tab=email ------- You are receiving this mail because: ------- You are watching the assignee of the bug. -- 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
