Ha, your firewall harddrive looks faster than your fileserver. You should run it a
couple of times so the first time it allocates memory and the other times it runs a
real benchmark.
You start tweaking by reading the man page.
quick reference:
c1/0 32-bit/16-bit mode
d1/0 dma on/off
ie. hdparm -c1 -d1 /dev/hda
Chris's Ultra66 went from 3.5mb to 27mb/sec. It looks like his single 7200rpm ultra66
drive reads faster than my Ultra160 3 drive, raid 5 10krpm array. :(
Cory
On Mon, Dec 04, 2000 at 10:55:11AM -0800, Bob Crandell wrote:
> My Firewall where I don't care haw fast the HD is:
> CSGate:~# hdparm -tT /dev/hda
>
> /dev/hda:
> Timing buffer-cache reads: 128 MB in 2.86 seconds =44.76
> MB/sec
> Timing buffered disk reads: 64 MB in 4.21 seconds =15.20
> MB/sec
>
> My file server (I'm hoping will replace our NW4.11 someday):
> csmule:~# hdparm -tT /dev/hda
>
> /dev/hda:
> Timing buffer-cache reads: 128 MB in 7.93 seconds = 16.14
> MB/sec
> Timing buffered disk reads: 64 MB in 6.18 seconds = 10.36
> MB/sec
> Hmm.. suspicious results: probably not enough free memory for a
> proper test.
> /dev/hdb:
> Timing buffer-cache reads: 128 MB in 7.82 seconds = 16.37
> MB/sec
> Timing buffered disk reads: 64 MB in 6.65 seconds = 9.62
> MB/sec
> Hmm.. suspicious results: probably not enough free memory for a
> proper test.
>
> csmule:~# free
> total used free shared buffers
> cached
> Mem: 160252 156112 4140 32752 118264
> 8412
> -/+ buffers/cache: 29436 130816
> Swap: 224896 2152 222744
>
> I've heard this stuff is tweak-able. How do I? Where do I
> start?
>
> >>> Cory Petkovsek <[EMAIL PROTECTED]> 12/2/2000 9:13:14
> PM >>>
> <snip>
> What kind of rates do you guys get with various hardware?
> Controllers, Raid, IDE, mdma/udma 33/66/100...
>
> Test your read speed under linux:
> ide only: (tests cache and disk reads, independently)
> hdparm -tT /dev/hda
>
> any drive:
> time dd if=/dev/sda of=/dev/null bs=1024 count=102400
> (returns minutes and seconds)
> bc
> 100/(minutes*60+seconds)
>
> <snip>
> Cory
