Subject: Re: help on choosing a SCSI card
To: Eduardo Horvath <eeh@NetBSD.org>
From: Rick Kelly <rmk@toad.rmkhome.com>
List: port-sparc64
Date: 05/06/2005 13:31:47
Eduardo Horvath said:

>The glm (Symbios card) can do faster bus transfers.  The isp is an extremely
>intelligent card and is capable of doing >1 interrupt/command.  (Yes, I do
>mean multiple commands/interrupt.)  So which one you want to use depends
>on the speed and number of drives on the SCSI bus.  If you have drives that
>can support ultra speeds and can transfer more than 20MB/s sustained, 
>you probably want to go with the glm.  If you do mostly sequential I/O
>the glm is probably better.  If you have slower disks or multiple disks on
>the spindle, the isp may be better.  If you do lots of random seeks then
>the isp will definitely be better.  And if you are CPU bound, definitely
>go with the isp.

Yup:

esiop0 at pci2 dev 1 function 0: Symbios Logic 53c875 (ultra-wide scsi)
esiop0: using on-board RAM
esiop0: interrupting at ivec 10
scsibus0 at esiop0: 16 targets, 8 luns per target

sd0 at scsibus0 target 6 lun 0: <IBM, IC35L018UWD210-0, S5CS> disk fixed
sd0: 17501 MB, 20765 cyl, 6 head, 287 sec, 512 bytes/sect x 35843670 sectors
sd0: sync (50.00ns offset 16), 16-bit (40.000MB/s) transfers, tagged queueing

NetBSD tencats 2.0.2 NetBSD 2.0.2 (TENCATS) #7: Tue Apr  5 16:45:05 MDT 2005  rmk@tencats:/usr/src/sys/arch/sparc64/compile/TENCATS sparc64

-- 
Rick Kelly	rmk@rmkhome.com
		<http://www.rmkhome.com/>
		<http://rkba.rmkhome.com/> - the right to keep and bear arms
		<http://wolf.rmkhome.com/> - firearm forums