Sorry for starting a new thread, but I was getting lost in the other about hdparm since it started out as about KDE.
On Thu, Nov 14, 2002 at 07:03:16PM +0530, Sandip P Deshmukh wrote: > # hdparm /dev/hda > > /dev/hda: > multcount = 16 (on) > I/O support = 1 (32-bit) > unmaskirq = 1 (on) > using_dma = 1 (on) > keepsettings = 1 (on) > nowerr = 0 (off) > readonly = 0 (off) > readahead = 8 (on) > geometry = 9729/255/63, sectors = 156301488, start = 0 > busstate = 1 (on) > > A lot of it will depend on the drive and the controller. For instance on my > older workstation (K7 650Mhz), I get the following: > > # hdparm -Tt /dev/hda > > /dev/hda: > Timing buffer-cache reads: 128 MB in 0.92 seconds =139.13 MB/sec > Timing buffered disk reads: 64 MB in 2.81 seconds = 22.78 MB/sec > > with an indentical configuration. However, turning off DMA on both of them > gives: > > K7 1Ghz > Timing buffered disk reads: 64 MB in 27.80 seconds = 2.30 MB/sec > K7 650Mhz > Timing buffered disk reads: 64 MB in 7.28 seconds = 8.79 MB/sec > > I normally use "hdparm -c1 -d1 -k1 /dev/hda", of course you'll want to change > the /dev/hda to whatever drive you're working with. > Now the kernel I am using I compiled myself and I selected to use DMA when available. Here is part of the kernel config: CONFIG_BLK_DEV_IDEPCI=y CONFIG_IDEPCI_SHARE_IRQ=y CONFIG_BLK_DEV_IDEDMA_PCI=y CONFIG_BLK_DEV_ADMA=y # CONFIG_BLK_DEV_OFFBOARD is not set CONFIG_IDEDMA_PCI_AUTO=y CONFIG_BLK_DEV_IDEDMA=y Now when I check with hdparm I get: # hdparm /dev/hda /dev/hda: multcount = 0 (off) I/O support = 0 (default 16-bit) unmaskirq = 0 (off) using_dma = 0 (off) keepsettings = 0 (off) nowerr = 0 (off) readonly = 0 (off) readahead = 8 (on) geometry = 77545/16/63, sectors = 78165360, start = 0 busstate = 1 (on) So it seems it is not on? Here are the speeds I get before any changes: /dev/hda: Timing buffer-cache reads: 128 MB in 0.46 seconds =278.26 MB/sec Timing buffered disk reads: 64 MB in 16.07 seconds = 3.98 MB/sec Anyway, now turning on DMA and 32 bit IO support: hdparm -c1 -d1 /dev/hda: setting 32-bit I/O support flag to 1 setting using_dma to 1 (on) I/O support = 1 (32-bit) using_dma = 1 (on) But rechecking to see if changes have worked: hdparm /dev/hda give exactly the same output as above. Rechecking the speeds and these are the same too. I guess it is turned on already and the drives won't tell hdparm, or it can't be turned on anyway. The drive is a Western Digital 400JB-00ENA0 (40GB 7200RPM ATA133) The mobo is a ASUS A7V8X using the ATA133 connector. Does anyone know what is happening here? Should I be able to improve the performance somehow or is this as good as it gets? Cheers. Mark. -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]
