On Thu, Nov 14, 2002 at 09:04:43AM -0700, Dan Owens wrote: > On Thu, 14 Nov 2002, Sandip P Deshmukh wrote: > > > On Wed, Nov 13, 2002 at 06:46:46AM -0700, Dan Owens wrote: > > > On Tue, 12 Nov 2002, Chip Rose wrote: > > > > > > Another thing you might want to check is if your hard drive needs dma > > > turned on. What speed does "hdparm -t /dev/hda" give you? > > > > /dev/hda: > > Timing buffered disk reads: 64 MB in 18.06 seconds = 3.54 MB/sec > > > > > Most of the > > > debian kernels don't have dma turned on and will give very poor perfomance > > > with data transfers, starting programs, etc. Windows turns dma on by > > > defualt.
my question - why doesnt debian turn dma on by default? dont we like fast machines?
> Yes, you probably need to turn it on. There are two basic ways to
> accomplish this. One is to use a kernel with dma and ultradma turned on.
> You can compile your own or upgrade to a debian kernel that does this
> (2.4.19, as far as I know) or you can use a script to turn it on at boot
> time with hdparm.
one small question - how do i know which kernel version am i using? i could not find
anything that looks like kernel and has a version number of 2.4.19 in dselect
> Please make sure to read the man pages for hdparm, as I am not an expert
> in hard drive optimization. The hdparm readme (/usr/share/doc/hdparm)
> also mentions using -c for best perfomance, but I haven't tried that.
i have done that and there is significant improvement in performance. here is my
output of hdparm -t /dev/hda:
/dev/hda:
Timing buffered disk reads: 64 MB in 3.58 seconds = 17.88 MB/sec
thanx a ton. does a discussion like this better suited in installation manuals of
debian?
thanx again.
sandip p deshmukh
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And what I was fencing out.
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