Date: Thu, 27 Apr 2006 21:17:28 +0200 From: "ml@sd2i.com" <ml@sd2i.com> To: freebsd-stable@freebsd.org Subject: Re: RELENG_4 -> 5 -> 6: significant performance regression Message-ID: <445118C8.7020603@sd2i.com> In-Reply-To: <20060427183541.GA67363@xor.obsecurity.org> References: <20060427160536.M96305@atlantis.atlantis.dp.ua> <20060427181226.GA66431@xor.obsecurity.org> <44510CBE.6050102@sd2i.com> <20060427183541.GA67363@xor.obsecurity.org>
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Kris Kennaway a écrit : > On Thu, Apr 27, 2006 at 08:26:06PM +0200, ml@sd2i.com wrote: >> Kris Kennaway a ?crit : >>> On Thu, Apr 27, 2006 at 05:08:11PM +0300, Dmitry Pryanishnikov wrote: >>> >>> >>>> options QUOTA >>> This definitely effects performance on 6.x since it makes your >>> filesystem giant-locked, which may also interfere with your network >>> processing. >> Why would QUOTA affect performance more on 6.x than 4.x ? I would like >> to understand because i think a system cannot be secure without QUOTA > > It makes filesystem writes acquire Giant, which blocks other kernel > code that needs to also acquire Giant. When the need to acquire Giant > was removed from the mainstream UFS code in 6.0 it was an enormous > performance improvement. Thanks for your anwser, but i'm not sure i understand... You wrote that Giant is needed in 6.0 and now you write it has been removed. So is it removed for 6-STABLE ? 6.1-rc ? Since i already use 6.x boxes, and i do have performance issues, i would upgrade to the right version immediatly R.
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