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Re: Fedora Core 3 test 2 performance



Thanks for the link. 

The drive is an IBM Travelstar 60gb 5400 rpm hard drive.

I booted into single user mode and did some testing to compare to what
I was seeing at runlevel 5. (cr = cached reads timing; br = buffered
reads timing)  The numbers represent the highest MB/sec from 4
consecutive executions of hdparm -tT

hdparm -c0 -d0 -u0 /dev/hda

Single user:
  cr: 704
  br: 2.89

RL 5
  cr: 698
  br: 2.46

hdparm -c1 -d1 -u1 /dev/hda

Single User:
  cr: 724
  br: 21.15

RL 5
cr: 709 MB/sec
br: 16.97 MB/sec

So, I guess at 16.97 MB/sec in runlevel 5, I'm seeing about the best I
can expect from this drive.  At least with more or less standard
hdparm settings.

So, I'm getting sufficient performance from the drives now, but
startup still takes about 4 minutes from entering my password.  If I
run hdparm -tT immediately after login, I see buffered reads around
2.5 MB/sec!

Top shows load averages around 2 with the CPU showing 90+% waiting. 
After a short while, the system drops to about 98% idle, but my disk
timings do not immediately improve.

Puzzling!

Glenn




On Fri, 08 Oct 2004 08:34:54 -0400, Ted Kaczmarek <tedkaz optonline net> wrote:
> Did enabling dma speed it up?
> 
> http://www.justlinux.com/nhf/Hardware/Hard_Drive_Speed_Tweak_for_Linux.html
> 
> Should have pasted this before.
> 
> I get consistent 36.00 MB/sec on my Sager, but it has 7200 rpm drive and
> this is with FC2 running 2.6.8-1.521.
> 
> Ted
> 
> 
> 
> On Fri, 2004-10-08 at 13:01 +0100, VJ wrote:
> > But he set DMA to 1 ( -d1 ).
> > VJ
> >
> > On Fri, October 8, 2004 1:00 pm, Ted Kaczmarek said:
> > >
> > >
> > > On Fri, 2004-10-08 at 07:29 -0400, Glenn Stauffer wrote:
> > >> I installed Core 3 test 2 on a Dell Precision M50 laptop.  The
> > >> performance is abysmal.
> > >>
> > >> >From the login screen to the desktop takes almost 4 minutes.  Disk
> > >> performance seems to have a lot to do with this.  With an hdparm line
> > >> like:
> > >>
> > >> hdparm -d1 -c1 -u1 /dev/hda
> > >>
> > >> I see variable results.  with repeated cycles of hdparm -t, I'll see
> > >> anything from 570 kB/sec to 10 MB/sec.  Nothing higher.  Other  Dell
> > >> laptop users report read rates closer to 20 MB/sec from what I can
> > >> glean from Internet posts.
> > >>
> > >> Any good resources for tuning a Fedora system?  Any other advice?
> > >>
> > >> Thanks, Glenn
> > >
> > >
> > > dma setting may be your problem.
> > >
> > > Ted
> > >
> > > --
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> > >
> >
> 
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