Esteban Ribičić wrote: > is it mounted sync or async? > Reading through the man page of hdparm, I gather that the benchmark performed using the -t flag will flush the IO-buffers and then read from the device. And since hdparm talks directly with the device, not via the file system, I think the result is probably quite accurate. (Not sure if it is peak or average or if there is much difference on flash card)
The -T option will test reading from the IO-buffers, so it is really a measurement of processor, cache and memory bus. Hope I haven't missed any details. Regards, Pontus. > On 12/18/07, Bent <[EMAIL PROTECTED]> wrote: > >> For what it is worth, here is a measurement done on a 5501 running Gentoo >> Linux: >> >> leopold ~ # hdparm -tT /dev/hda >> >> /dev/hda: >> Timing cached reads: 390 MB in 2.01 seconds = 194.14 MB/sec >> Timing buffered disk reads: 34 MB in 3.14 seconds = 10.82 MB/sec >> leopold ~ # hdparm -tT /dev/hdb >> >> /dev/hdb: >> Timing cached reads: 388 MB in 2.00 seconds = 194.03 MB/sec >> Timing buffered disk reads: 72 MB in 3.05 seconds = 23.60 MB/sec >> leopold ~ # >> >> hda is a 8 GB SanDisk Ultra II. It is spec'ed to 10 MB/s on the package. >> hdb is a 80 GB Seagate SATA disk. >> >> 73, Bent >> _______________________________________________ >> Soekris-tech mailing list >> [email protected] >> http://lists.soekris.com/mailman/listinfo/soekris-tech >> >> > _______________________________________________ > Soekris-tech mailing list > [email protected] > http://lists.soekris.com/mailman/listinfo/soekris-tech > _______________________________________________ Soekris-tech mailing list [email protected] http://lists.soekris.com/mailman/listinfo/soekris-tech
