Subject: Re: pciide performance on alpha
To: Jarle Greipsland <>
From: Jason Thorpe <>
List: port-alpha
Date: 08/12/1999 03:30:00
On Thu, 12 Aug 1999 11:21:46 +0200 
 Jarle Greipsland <> wrote:

 > ccd0 is striped across 3 RZ29B disks on a NCR53c860 fast, narrow controller.
 > sd0 is an IBM DDRS-39130W disk on an Qlogic 1040B controller.
 > wd0 is an IBM-DJNA-370910 disk on the builtin IDE controller.
 > When reading directly from /dev/rwd0c I get slightly better numbers,
 > 15-16MB/s sustained.  Generating a file (from /dev/zero) on wd0g
 > writes approximately 14-15 MB/s through the file system (plain FFS).

Modern IDE can be a bit faster than SCSI because the per-command overhead
is lower in the protocol.  So, this isn't surprising.

        -- Jason R. Thorpe <>