Date: Thu, 7 Apr 2011 21:25:40 +0000 From: Alexander Best <arundel@freebsd.org> To: Garrett Cooper <yanegomi@gmail.com> Cc: svn-src-head@freebsd.org, Alexander Motin <mav@freebsd.org>, src-committers@freebsd.org, svn-src-all@freebsd.org Subject: Re: svn commit: r220412 - in head: share/man/man4 sys/cam/ata Message-ID: <20110407212540.GB17091@freebsd.org> In-Reply-To: <BANLkTik7Pj5NiEM%2BNeu=neknTxshwcmk-g@mail.gmail.com> References: <201104070817.p378HrHc033571@svn.freebsd.org> <20110407190318.GA97508@freebsd.org> <BANLkTik7Pj5NiEM%2BNeu=neknTxshwcmk-g@mail.gmail.com>
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On Thu Apr 7 11, Garrett Cooper wrote: > On Thu, Apr 7, 2011 at 12:03 PM, Alexander Best <arundel@freebsd.org> wrote: > > On Thu Apr 7 11, Alexander Motin wrote: > >> Author: mav > >> Date: Thu Apr 7 08:17:53 2011 > >> New Revision: 220412 > >> URL: http://svn.freebsd.org/changeset/base/220412 > >> > >> Log: > >> Make ada(4) driver to control device write cache, same as ata(4) does. > >> Add kern.cam.ada.write_cache sysctl/tunable to control it alike hw.ata.wc. > > > > how hard would it be to support per device sysctls/tunables? i'd really like to > > do: > > > > kern.cam.ada.0.write_cache=0 (root fs) > > kern.cam.ada.1.write_cache=1 (/usr, /var, etc.) > > Does it really make sense to turn on write caching for one drive and > not the other(s)? i think so. for "/" i want maximum safebelts. so i'd like to disable the write cache and mount it with the "sync" option. for /usr/ and all the other mount points i'd like maximum speed with write caching enabled and mounted with the "noasync" and "noatime" options. cheers. alex > Thanks, > -Garrett -- a13x
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