lkml.org 
[lkml]   [1999]   [May]   [4]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
Subject[off-topic] Re: Kenwood/Hi-Val True-X 40x CDROM drive.
On Tue, May 04, 1999 at 04:51:57AM -0400, Mike A. Harris allegedly wrote:

> On Tue, 4 May 1999, BROWN Nick wrote:
>
> >I've given up on hdparm. With my generic IDE disk, I get 8 MB/sec, and
> >about 22 MB/sec if I read from the cache.
>
> I get:
>
> 2 root@red:/# hdparm -tT /dev/hd[ab]
>
> /dev/hda:
> Timing buffer-cache reads: 64 MB in 1.69 seconds =37.87 MB/sec
> Timing buffered disk reads: 32 MB in 3.29 seconds = 9.73 MB/sec
>
> /dev/hdb:
> Timing buffer-cache reads: 64 MB in 1.67 seconds =38.32 MB/sec
> Timing buffered disk reads: 32 MB in 5.01 seconds = 6.39 MB/sec
>
> >With my 7200 rpm SCSI disks (OK, SCSI-2, not SCSI-3, but
> >still...), I get between 1.8 and 3.5 MB/sec (depending on wind
> >direction, it seems) reading the disk, and 25 to 33 MB/sec
> >reading the cache (which presumably means it's not the
> >controller being slower than IDE).
>
> My hdparm results seem very indicative of actual transfer rates
> for IDE disks.

Hmm, now I'm a bit confused. I just tested my disks again and the results
I'm getting now seem to be ok. (I did the other tests a few days ago.) I
now get:

/dev/hda: (Maxtor 90845D4)
Timing buffer-cache reads: 64 MB in 0.89 seconds =71.91 MB/sec
Timing buffered disk reads: 32 MB in 2.17 seconds =14.75 MB/sec

/dev/hdb: (Seagate ST31722A)
Timing buffer-cache reads: 64 MB in 0.88 seconds =72.73 MB/sec
Timing buffered disk reads: 32 MB in 5.53 seconds = 5.79 MB/sec

/dev/hdc: (Maxtor 90845D4)
Timing buffer-cache reads: 64 MB in 0.87 seconds =73.56 MB/sec
Timing buffered disk reads: 32 MB in 2.17 seconds =14.75 MB/sec

/dev/md0: (hda & hdc in RAID0 config)
Timing buffer-cache reads: 64 MB in 0.88 seconds =72.73 MB/sec
Timing buffered disk reads: 32 MB in 1.62 seconds =19.75 MB/sec

/dev/sda: (external zipdrive)
Timing buffer-cache reads: 64 MB in 0.92 seconds =69.57 MB/sec
Timing buffered disk reads: 32 MB in 38.05 seconds = 0.84 MB/sec

Also, I find it a bit odd you CAN test IDE CD-ROMS, but not SCSI ones.

Mathijs

-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.rutgers.edu
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2005-03-22 13:51    [W:0.066 / U:0.044 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site