Date: Mon, 6 Sep 2010 14:04:06 +0300 From: Kostik Belousov <kostikbel@gmail.com> To: Andriy Gapon <avg@icyb.net.ua> Cc: freebsd-fs@freebsd.org, jhell <jhell@DataIX.net> Subject: Re: zfs very poor performance compared to ufs due to lack of cache? Message-ID: <20100906110406.GC2396@deviant.kiev.zoral.com.ua> In-Reply-To: <4C84C857.1070306@icyb.net.ua> References: <7EA7AD058C0143B2BF2471CC121C1687@multiplay.co.uk> <1F64110BFBD5468B8B26879A9D8C94EF@multiplay.co.uk> <4C83A214.1080204@DataIX.net> <06B9D23F202D4DB88D69B7C4507986B7@multiplay.co.uk> <4C842905.2080602@DataIX.net> <330B5DB2215F43899ABAEC2CF71C2EE0@multiplay.co.uk> <4C84C857.1070306@icyb.net.ua>
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--8OiOAIKaPG+pF/lZ Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Mon, Sep 06, 2010 at 01:54:15PM +0300, Andriy Gapon wrote: > on 06/09/2010 02:57 Steven Hartland said the following: > > Based on Jeremy's comments I'm updating the box the stable. Its buildin= g now > > but will be the morning before I can reboot to activate changes as I ne= ed to > > deactivate the stream instance and wait for all active connections to f= inish. > >=20 > > That said the problem doesn't seem to be cache + free but more cache + = free > > + inactive with inactive being the large chunk, so not sure this change > > would make any difference? > >=20 > > How does ufs deal with this, does it take inactive into account? Seems = a bit > > silly for inactive pages to prevent reuse for extended periods when the > > memory could be better used as cache. >=20 > Inactive pages are also a cache, just a different kind. Not quite. Inactive pages may be dirty. Such pages cannot be freed or reused without pageout. --8OiOAIKaPG+pF/lZ Content-Type: application/pgp-signature Content-Disposition: inline -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.10 (FreeBSD) iEYEARECAAYFAkyEyqUACgkQC3+MBN1Mb4ihNwCg4VmgCRYh0+IOcXXcNBdz0yp3 PykAoJUB8210nDg466U5UMszRamFluej =V4aD -----END PGP SIGNATURE----- --8OiOAIKaPG+pF/lZ--
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