Date: Thu, 17 Jan 2013 10:14:30 -0500 From: Eitan Adler <lists@eitanadler.com> To: Fabian Keil <freebsd-listen@fabiankeil.de> Cc: questions@freebsd.org Subject: Re: absurd I/O perf with ZFS: hangs on zfs->cv) Message-ID: <CAF6rxgnx4CXgHBR9SEUebps7LjL%2Bk0UczbncNrSpoPpU7qCmAw@mail.gmail.com> In-Reply-To: <20130117135241.434f273a@fabiankeil.de> References: <CAF6rxgkJr7xrmZkkp0eH_-WzuvdmCBDwPPOZFoqWUZ2jqXqneg@mail.gmail.com> <CAF6rxgkCWC_HopEWqhMKw245itPXKJbn4_DD66NKiD1di8ysWw@mail.gmail.com> <20130117135241.434f273a@fabiankeil.de>
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On 17 January 2013 07:52, Fabian Keil <freebsd-listen@fabiankeil.de> wrote: > Eitan Adler <lists@eitanadler.com> wrote: > I don't think there are any laptops with "large amounts of RAM" > as far as ZFS is concerned. Haha okay: 8GB of RAM. >> It is taking me 45 minutes to make 5 commits to git. Something is >> wrong here but I have no idea what I should be looking at. Any ideas? > > Try sysutils/zfs-stats to get a rough idea of how ZFS is using > the available memory. Anything in particular I should be looking for? > If you already followed tuning advice from the Internet without > benchmarking it, try reverting it. I have done absolutely no tuning. Is there anything in particular I *should* tune? > Once you have gathered some more information it might make sense > to ask again on freebsd-fs@. Ack. > On a new system it's probably not an issue, but the recommendation > is to keep around 20% of the pool free to keep the performance up. Good to know. I will be careful here. -- Eitan Adler
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