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Message-ID: <Pine.LNX.4.63.0607271129380.11253@qynat.qvtvafvgr.pbz> Date: Thu, 27 Jul 2006 11:30:54 -0700 (PDT) From: David Lang <dlang@...italinsight.com> To: Jan Kasprzak <kas@...muni.cz> cc: dean gaudet <dean@...tic.org>, Alan Cox <alan@...rguk.ukuu.org.uk>, linux-kernel@...r.kernel.org Subject: Re: 3ware disk latency? On Thu, 27 Jul 2006, Jan Kasprzak wrote: > dean gaudet wrote: > : my suspicion is the 3ware lacks any sort of "fairness" in its sharing of > : buffer space between multiple units on the same controller. and by > : disabling the write caching it limits the amount of controller memory that > : the busy disk can consume. > > Hmm, do you have a battery backup unit for 9550sx? I don't, > and the 3ware BIOS does not even allow me to enable write caching without it. > So I don't think the write caching on the controller side is related > to my problem. interesting, on the 9500 series cards I have it pops up a 'are you really sure, this is dangerous' warning, but it did allow me to turn on write caching (I've since received the batteries, but I did test it before that) David Lang > I have been able to improve the latency by upgrading the firmware > to the newest release (wow, they even have a firmware updating utility > for Linux!). > > -Yenya > > - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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