Date: Fri, 06 Jun 1997 14:34:51 -0600 From: "Justin T. Gibbs" <gibbs@plutotech.com> To: Bob Bishop <rb@gid.co.uk> Cc: freebsd-hackers@FreeBSD.ORG Subject: Re: Extremely poor interactive response under heave SCSI load Message-ID: <199706061936.NAA00243@pluto.plutotech.com> In-Reply-To: Your message of "Fri, 06 Jun 1997 11:38:08 BST." <l03020900afbd97441c6f@[194.32.164.2]>
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>Quick (and nasty) hack: in scsi/sd.c, if the device has been continuously >busy for say > 1sec, just stop feeding it until it has drained. > >Better hack: if the oldest request on the device has been there for say > >1sec, stop feeding until that request has completed. > >None of this would be necessary if sequencers were a bit less totalitarian... Even better hack. Just send an ordered transaction every once in a while which will flush any "starved" simple-tagged transactions. This means that you can always keep the queue full. >-- >Bob Bishop (0118) 977 4017 international code +44 118 >rb@gid.co.uk fax (0118) 989 4254 between 0800 and 1800 UK > > > -- Justin T. Gibbs =========================================== FreeBSD: Turning PCs into workstations ===========================================
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