Are you using HDD? Can you disable sreadahead and have a monitor again for the throughput?
-----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of axel lin Sent: 2009年3月2日 7:41 To: [email protected] Subject: [Moblin Dev] Bootchart disk throughput hi list, I checked my moblin2 bootchart and found the maximum disk throughput is only 8MB/s, However I got 25.21 MB/sec if I test with hdparm -tT /dev/sda. Why the number is so much different between bootchart and hdparm test? Below shows my disk information: -bash-3.2# hdparm -tT /dev/sda /dev/sda: Timing cached reads: 756 MB in 2.00 seconds = 378.02 MB/sec Timing buffered disk reads: 76 MB in 3.01 seconds = 25.21 MB/sec -bash-3.2# -bash-3.2# hdparm -i /dev/sda /dev/sda: Model=TOSHIBA MK8009GAH , FwRev=BS011A , SerialNo= 38B3W2NBW Config={ Fixed } RawCHS=16383/16/63, TrkSize=0, SectSize=0, ECCbytes=0 BuffType=unknown, BuffSize=0kB, MaxMultSect=16, MultSect=?16? CurCHS=16383/16/63, CurSects=16514064, LBA=yes, LBAsects=156301488 IORDY=on/off, tPIO={min:120,w/IORDY:120}, tDMA={min:120,rec:120} PIO modes: pio0 pio1 pio2 pio3 pio4 DMA modes: sdma0 sdma1 sdma2 mdma0 mdma1 mdma2 UDMA modes: udma0 udma1 udma2 udma3 udma4 *udma5 AdvancedPM=yes: unknown setting WriteCache=enabled Drive conforms to: Unspecified: ATA/ATAPI-1,2,3,4,5,6 * signifies the current active mode -bash-3.2# hdparm /dev/sda /dev/sda: IO_support = 0 (default) 16-bit) HDIO_GET_UNMASKINTR failed: Inappropriate ioctl for device HDIO_GET_DMA failed: Inappropriate ioctl for device HDIO_GET_KEEPSETTINGS failed: Inappropriate ioctl for device readonly = 0 (off) readahead = 256 (on) geometry = 9729/255/63, sectors = 156301488, start = 0 Regards, Axel _______________________________________________ Moblin dev Mailing List [email protected] To manage or unsubscribe from this mailing list visit: https://lists.moblin.org/mailman/listinfo/dev or your user account on http://moblin.org once logged in. For more information on the Moblin Developer Mailing lists visit: http://moblin.org/community/mailing-lists _______________________________________________ Moblin dev Mailing List [email protected] To manage or unsubscribe from this mailing list visit: https://lists.moblin.org/mailman/listinfo/dev or your user account on http://moblin.org once logged in. For more information on the Moblin Developer Mailing lists visit: http://moblin.org/community/mailing-lists
