Date: Fri, 07 Apr 2000 09:18:02 -0400 From: Andrew Heybey <ath@niksun.com> To: "Justin T. Gibbs" <gibbs@FreeBSD.ORG> Cc: mjacob@feral.com, freebsd-bugs@FreeBSD.ORG, freebsd-scsi@FreeBSD.ORG Subject: Re: kern/17153 (was: newfs on IBM disks slower than Seagate disks?) Message-ID: <200004071318.JAA15202@celis.niksun.com> In-Reply-To: Your message of Wed, 05 Apr 2000 20:07:26 -0600. <200004060207.UAA24407@caspian.plutotech.com>
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It would seem that the WCE bit is the answer. The IBM has it set to zero while the Seagates have it set to 1. Unlike Matt Jacob, I get substantially the same performance for normal IO: IBM: install8 1# dd if=/dev/rda0s1c of=/dev/null bs=1024k count=200 200+0 records in 200+0 records out 209715200 bytes transferred in 7.561781 secs (27733572 bytes/sec) Seagate: su-2.03# dd if=/dev/rda0s1c of=/dev/null bs=1024k count=200 200+0 records in 200+0 records out 209715200 bytes transferred in 7.520681 secs (27885135 bytes/sec) I don't have any partitions lying around that I can newfs to test the WCE hypothesis, but it seems the most logical answer. andrew To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-scsi" in the body of the message
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