Date: Mon, 3 Aug 1998 19:27:49 +0000 (GMT) From: Terry Lambert <tlambert@primenet.com> To: bde@zeta.org.au (Bruce Evans) Cc: current@FreeBSD.ORG, rock@cs.uni-sb.de Subject: Re: IO performance (UFS read clustering), bad ZIP drive performance Message-ID: <199808031927.MAA01657@usr07.primenet.com> In-Reply-To: <199808030726.RAA16337@godzilla.zeta.org.au> from "Bruce Evans" at Aug 3, 98 05:26:02 pm
next in thread | previous in thread | raw e-mail | index | archive | help
> >I get unacceptable performance from my SCSI ZIP drive (compared to other > >operating systems). While UFS writing is OK (up to the capabilities of the > >drive: 600-1000 kB/s), everything else (UFS read, MSDOSFS r/w, mtools) > >is extremely slow (down to 80 kB/s). > > ufs clustered reads have been broken (except on wd drives) since rev.1.18 > (1998/01/24) of ufs_bmap.c. SCSI ZIPs have a huge command overhead > (20 msec here on an ncr 53c810) and don't seem to support tags, so > performance without clustering is poor. > > Fix: Is there a particula reason you are posting this to -current instead of to the CVS tree? Terry Lambert terry@lambert.org --- Any opinions in this posting are my own and not those of my present or previous employers. To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-current" in the body of the message
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?199808031927.MAA01657>