Date: Sat, 28 Aug 2010 11:13:55 +0300 From: Andriy Gapon <avg@icyb.net.ua> To: jhell <jhell@DataIX.net> Cc: freebsd-current@freebsd.org, Artem Belevich <fbsdlist@src.cx>, Martin Matuska <mm@freebsd.org> Subject: Re: [CFT] Improved ZFS metaslab code (faster write speed) Message-ID: <4C78C543.40302@icyb.net.ua> In-Reply-To: <4C78655C.3010200@DataIX.net> References: <4C713EF5.8080402@FreeBSD.org> <AANLkTi=8x1EenWyqGz6AQWKDUq5JiMJbX_jbVbX43DKx@mail.gmail.com> <4C714FC0.90005@FreeBSD.org> <AANLkTim_BH4WrQUY-X491c%2BfLaP2FKMcS1k-DN5tLG-9@mail.gmail.com> <20100828081917.ee931f7f.nork@FreeBSD.org> <AANLkTi=hbL3wfTvmfBhPkpJ7orh_WuhagGPoXaS_hcTW@mail.gmail.com> <4C78655C.3010200@DataIX.net>
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on 28/08/2010 04:24 jhell said the following: > I must have missed the uma defrag patches but according to the code > those patches should not have any effect on your implimentation of ZFS > on your system because vfs.zfs.zio.use_uma defaults to off unless you > have manually turned this on or the patch reverts that facility back to > its original form. ZFS uses UMA even for other things besides ARC and those are not controlled by vfs.zfs.zio.use_uma. Those zones also happen to be the most fragmented ones for me. To name a few: dnode_t, dmu_buf_impl_t, arc_buf_hdr_t. So the patch should help there. -- Andriy Gapon
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