Date: Fri, 19 Mar 1999 17:13:22 -0500 From: Andrew Heybey <ath@niksun.com> To: Gerard Roudier <groudier@club-internet.fr> Cc: freebsd-scsi@freebsd.org Subject: Re: NCR 895 performance Message-ID: <199903192213.RAA15833@stiegl.niksun.com> In-Reply-To: Your message of Fri, 19 Mar 1999 22:06:00 %2B0100. <Pine.LNX.3.95.990319214424.664A-100000@localhost>
next in thread | previous in thread | raw e-mail | index | archive | help
> Things that can explain at least part of the difference may be, in my > opinion: > > 1 - Some important features of the chip not being enabled. > 2 - The different number of tags. > 3 - The way the FreeBSD ncr driver walk the CCB list on reselection. > 4 - Also the number of interrupts. > > Could you make the same benchmark using a small number of tags, for > example 8 and report the interrupts and IO statistics of both drivers for > that benchmark. Thanks for the reply. When I get a little time, I will try the same benchmark with the same number of tags for each controller. > It would also be interesting to know which of the following features: > - Prefetch > - Burst-op > - Cache Line size > - Write and Invalidate > - Bursting (and burst size max) > - On-chip RAM > were being used in your evaluation of the 895. I used whatever sys/pci/ncr.c gives me. Do you have any suggestions as to which features should be set how? andrew To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-scsi" in the body of the message
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?199903192213.RAA15833>