Disk I/O - too slow?

[Doncho N. Gunchev]

On Tuesday 24 February 2004 03:30, Don Levey wrote:
> On Sun, 2004-02-22 at 05:15, Dean Mumby wrote:
> 
> I have a intel d865perl mb with hyperthreading , sata , and all the same
> features , i installed fedora , redhat 9, etc with legacy mode and then
> simply switched to enhanced mode and i am running fine. did you check
> wether your system had enabled dma
> 
>  hdparm -tT /dev/sda
> 
> /dev/sda:
>  Timing buffer-cache reads:   3568 MB in  2.00 seconds = 1784.00 MB/sec
>  Timing buffered disk reads:  166 MB in  3.00 seconds =  55.33 MB/sec
> 
> not slow at all
> ----------------
> 
> So...  I've got DMA enabled, Multiple I/O, EIDE 32-bit and lookahead
> enabled in my /etc/sysconfig/harddisks file.  Running that hdparm line
> gives me:
> 
> /dev/hdb: 
> Timing buffer-cache reads:   1204 MB in  2.00 seconds = 601.49 MB/sec
> Timing buffered disk reads:   96 MB in  3.00 seconds =  31.97 MB/sec
> 
> ...clearly *not* fast.  This is a Maxtor Diamond ATA 120Gb drive,
> 7200rpm, on an ASUS A7V8X-X mb.  I'm running FC1 with a 2.6.3 kernel
> from kernel.org.  Any suggestions for speeding up my I/O (or more info
> to provide)?
> 
> TIA,  -Don
> 
I have similar problem with Fedora Core 2 test1. With SiS 735 and 80G
Baracuda. With 2.4.x Fedora Core 1 kernels - 51MB/sec raw transfer but
with 2.6.x - 31MB/sec raw... :( /the cached transfer with 2.6 is faster/.
With RedHat 9 I had 31MB/sec... anyone else... do we have to fill kernel
bug report in bugzilla or?

-- 
Regards,
  Doncho N. Gunchev    Registered Linux User #291323 at counter.li.org
  GPG-Key-ID: 1024D/DA454F79
  Key fingerprint = 684F 688B C508 C609 0371  5E0F A089 CB15 DA45 4F79