Date: Sun, 07 Jun 1998 21:10:01 -0600 From: "Justin T. Gibbs" <gibbs@plutotech.com> To: jak@cetlink.net (John Kelly) Cc: "Justin T. Gibbs" <gibbs@plutotech.com>, scsi@FreeBSD.ORG Subject: Re: buslogic problems Message-ID: <199806080314.VAA13557@pluto.plutotech.com> In-Reply-To: Your message of "Sun, 07 Jun 1998 23:22:07 GMT." <357b1f75.2360909@mail.cetlink.net>
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>On Thu, 4 Jun 1998 14:33:02 -0600 (MDT), "Justin T. Gibbs"
><gibbs@narnia.plutotech.com> wrote:
>
>>You may want to try using the CAM SCSI patches. You will need to use
>>2.2-stable sources, but CAM does provide a better driver for the BusLogic
>
>I tried the 980520 CAM on a Buslogic 445C VLB, and it's much slower.
>With the old scsi driver I can copy /usr/src/usr.sbin to another drive
>in 1 minute 35 seconds, but with CAM it took 2 minutes 15 seconds.
>
>Both tests run on the same machine, before and after installing CAM.
Most likely the degradation is from using ordered tags. Try this
change around line 936 of sys/cam/scsi/scsi_da.c:
#if 0
if ((bp->b_flags & B_ORDERED) != 0
|| (softc->flags & DA_FLAG_NEED_OTAG) != 0) {
softc->flags &= ~DA_FLAG_NEED_OTAG;
softc->ordered_tag_count++;
tag_code = MSG_ORDERED_Q_TAG;
} else {
tag_code = MSG_SIMPLE_Q_TAG;
}
#else
tag_code = MSG_SIMPLE_Q_TAG;
#endif
--
Justin
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