Date: Sun, 14 Feb 1999 10:25:13 -0800 (PST) From: Matthew Jacob <mjacob@feral.com> To: Andreas Klemm <andreas@klemm.gtn.com> Cc: "Kenneth D. Merry" <ken@plutotech.com>, ANDREAS.KLEMM.AK@bayer-ag.de, scsi@FreeBSD.ORG Subject: Re: It%s not the write cache on 3.0-STABLE and not tagged comma Message-ID: <Pine.LNX.4.04.9902141022010.26546-100000@feral-gw> In-Reply-To: <19990213114641.B6068@titan.klemm.gtn.com>
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> But if write performance is poor, but actually doesn't eat up > that much CPU performance. Why is the FreeBSD machine so much > "in-responsive". It means I merely can login on a second console, > I have to wait 10-15 seconds for a login. And the execution of > commands lags lags lags. This kind of blockage is often a VM/Buffer Cache type of issue- the same problem applies in Linux. If you don't put some hysteresis into you're bdelwri queue, you end up swamping the system writing out to one spindle. This whole area of system performance, including whether or not using the maximum number of tags you can, needs to be really thought through and *metrics* used to prove or disprove cases. -matt To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-scsi" in the body of the message
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