Date: Mon, 08 Nov 2004 19:14:54 +0100 From: Gary Jennejohn <garyj@jennejohn.org> To: Divacky Roman <xdivac02@stud.fit.vutbr.cz> Cc: current@freebsd.org Subject: Re: [HEADSUP] Please help test device vnode bypass! Message-ID: <200411081815.iA8IEsgd039802@peedub.jennejohn.org> In-Reply-To: Message from Divacky Roman <xdivac02@stud.fit.vutbr.cz> <20041108173007.GA93246@stud.fit.vutbr.cz>
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Divacky Roman writes: > > > On a 700MHz K7 machine this doubles the speed of > > > dd if=/dev/zero of=/dev/null bs=1 count=1000000 > > > > > > This roughly translates to shaving 2usec of each read/write syscall. > > I tried it (no problem yet) and did a bit testing... > (cp -R /sys/ /tmp/s, dd if=/dev/zero of=smth count=1000000, cp smth smth1 and > so on) > > and it seems like its actually a bit slower (but everything works properly) - > did I get anything wrong? should the results be a bit better (I did three run > s > every time of each test) > You evidently missed the point that this change benefits accesses to _devices_. All your tests are using files. --- Gary Jennejohn / garyj[at]jennejohn.org gj[at]freebsd.org garyj[at]denx.de
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