Date: Tue, 11 Oct 2011 10:16:02 -0700 From: Artem Belevich <art@freebsd.org> To: Steven Hartland <killing@multiplay.co.uk> Cc: =?ISO-8859-1?Q?Micka=EBl_Maillot?= <mickael.maillot@gmail.com>, Christer Solskogen <christer.solskogen@gmail.com>, freebsd-stable@freebsd.org, Ivan Voras <ivoras@freebsd.org>, Jeremy Chadwick <freebsd@jdc.parodius.com> Subject: Re: "High" cpu usage when using ZFS cache device Message-ID: <CAFqOu6i507j1tksV7xDYXsgUhQfp=JiKSXVnQHqM3ZQWyozG6A@mail.gmail.com> In-Reply-To: <852472071289497FA806928D0B41D0FE@multiplay.co.uk> References: <AANLkTinzwyhABYxzWknzRFzLCbcDSd3BU2kQ5tX_SSk-@mail.gmail.com> <20101116003029.GC79816@numachi.com> <AANLkTinfTgXzf7t3PtO2VAef7NSkKWc0RnGdpv=6_-Vj@mail.gmail.com> <ibtqvp$bfq$1@dough.gmane.org> <AANLkTi=tJ-Hf%2BrMqG0=tEzNV2jJW-B_7Yu_ftW4tAMqT@mail.gmail.com> <20101116125431.GA90475@icarus.home.lan> <AANLkTi=mAWYCnWbWbX9B9fa05iyC_pivu08v-%2BbOf75f@mail.gmail.com> <AANLkTi=p9U6gK=Z5GyrAEzU2tDqbx%2ByWY=4eTZ5-0CuF@mail.gmail.com> <AANLkTi=XwO0RrU9uY5CF5p%2Bb9co1yneXX7UR2JsF55bL@mail.gmail.com> <AANLkTiknP4D5aayotFQ1jFpmov9Vv50GnFdVaXXs39rL@mail.gmail.com> <AANLkTikjd5CgcC3TEhLYuBXGukP0mUCyHtY-FwfYqs1K@mail.gmail.com> <852472071289497FA806928D0B41D0FE@multiplay.co.uk>
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On Tue, Oct 11, 2011 at 2:34 AM, Steven Hartland <killing@multiplay.co.uk> wrote: > ----- Original Message ----- From: "Micka=EBl Maillot" > <mickael.maillot@gmail.com> > > >> same problem here after ~ 30 days with a production server and 2 SSD Int= el >> X25M as L2. >> so we update and reboot the 8-STABLE server every month. > > Old thread but also seeing this on 8.2-RELEASE so looks like this > may still be an issue. > > In our case this machine was running mysql with 2 x 60GB cache > SSD's. I checked for usage when the machine was idle just before > reboot to fix and the l2arc thread was still using 100% of a core > even with no disk access happening. > > Was a PR ever raised for this? No, there was no PR. L2arc CPU hogging after ~24 days was fixed in r218180 in -HEAD and was MFC'ed to 8-stable in r218429 early in February '11. If you're using 8-RELEASE, upgrading to 8-STABLE would be something to consider as there were other ZFS-related issues fixed there that didn't make it into -RELEASE. --Artem
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