Date: Thu, 22 Apr 1999 18:49:36 -0400 (EDT) From: Mikhail Teterin <mi@misha.cisco.com> To: dnelson@emsphone.com (Dan Nelson) Cc: gjohnson@nola.srrc.usda.gov, questions@FreeBSD.ORG Subject: Re: writing slower with SoftUpdates Message-ID: <199904222249.SAA96045@misha.cisco.com> In-Reply-To: <19990422174301.B51036@dan.emsphone.com> from Dan Nelson at "Apr 22, 1999 05:43:02 pm"
next in thread | previous in thread | raw e-mail | index | archive | help
Dan Nelson once wrote: > In the last episode (Apr 22), Glenn Johnson said: > > Interesting! I ran your script and found all three of my SCSI drives > > had write caching enabled. Is it the same situation with IDE drives > > and softupdates with regards to performance degradation? > Most IDE drives don't even support command queueing and have such > small internal buffers compared to equivalent SCSI drives (i.e. IBM's > Deskstar 16gb IDE has a 512k cache, while the Ultrastar 18gb SCSI has > a 2MB cache), so you're not going to see much of a decrease because of > the write cache. It is surprising, nothing in FreeBSD tries to take advantage of this huge caches... My first computer only had 128Kb of RAM in it... -mi To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?199904222249.SAA96045>