Date: Tue, 16 Nov 2010 12:47:09 +0100 From: Ivan Voras <ivoras@freebsd.org> To: freebsd-stable@freebsd.org Subject: Re: "High" cpu usage when using ZFS cache device Message-ID: <ibtqvp$bfq$1@dough.gmane.org> In-Reply-To: <AANLkTinfTgXzf7t3PtO2VAef7NSkKWc0RnGdpv=6_-Vj@mail.gmail.com> References: <AANLkTinzwyhABYxzWknzRFzLCbcDSd3BU2kQ5tX_SSk-@mail.gmail.com> <20101116003029.GC79816@numachi.com> <AANLkTinfTgXzf7t3PtO2VAef7NSkKWc0RnGdpv=6_-Vj@mail.gmail.com>
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On 11/16/10 08:16, Christer Solskogen wrote: > On Tue, Nov 16, 2010 at 1:30 AM, Brian Reichert<reichert@numachi.com> wrote: >> On Mon, Nov 15, 2010 at 09:50:50PM +0100, Christer Solskogen wrote: >>> My load on my i7 920 is certainly higher when I add a 8GB usb stick as >>> a ZFS cache device. >> >> USB 1.0? 2.0? Dunno even if that would make a difference... > > This is USB 2.0. I didn't know USB had such much to say on the cpu. You can easily test it - use the stick as a simple disk device with UFS and see how much CPU does it take simply to talk to the device.
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