Re: OT: performance problems.

[Bill Morgan <bilmor@austin.rr.com>]

>>>> /dev/hda2:
>>>>  Timing buffer-cache reads:   128 MB in  0.99 seconds = 129.29 MB/sec
>>>>  Timing buffered disk reads:  64  MB in 21.93 seconds =   2.92 MB/sec
>>> 
>>> /dev/hda1:
>>>  Timing buffer-cache reads:   128 MB in  0.77 seconds =166.23 MB/sec
>>>  Timing buffered disk reads:  64 MB in  3.33 seconds = 19.22 MB/sec
>> 
>> jealous! what's the RPM on your drive?
> 
> Are you sure it's something to get jealous over? I'm pretty sure I have
> a 5400rpm 20GB drive (by Fujitsu). Look at my stats after I enabled DMA and
> (some other kernel options I don't have at the tip of my finger right
> now):
> 
> # hdparm -Tt /dev/hda
> 
> /dev/hda:
> Timing buffer-cache reads:   128 MB in  0.82 seconds =156.10 MB/sec
> Timing buffered disk reads:  64 MB in  2.99 seconds = 21.40 MB/sec
> 
> I've seen a discussion here some whiles back about a guy who got
> 33MB+/sec.
> 

There's a good article on hdparm and its usage at

  http://linux.oreillynet.com/lpt/a/linux/2000/06/29/hdparm.html

Mine went from 

  /dev/hdb:
   Timing buffer-cache reads:   128 MB in  1.93 seconds = 66.32 MB/sec
   Timing buffered disk reads:  64 MB in 24.01 seconds =  2.67 MB/sec

to

  /dev/hdb:
   Timing buffer-cache reads:   128 MB in  1.92 seconds = 66.67 MB/sec
   Timing buffered disk reads:  64 MB in  3.46 seconds = 18.50 MB/sec

After a few minutes' tinkering.

Have fun...

Bill