From mboxrd@z Thu Jan 1 00:00:00 1970 Message-ID: <3BF57B4F.7B0ABCC@inn.ericsson.se> Date: Fri, 16 Nov 2001 21:47:11 +0100 From: Kenneth Johansson MIME-Version: 1.0 To: Dan Malek Cc: Armin Kuster , "linuxppc-embedded@lists.linuxppc.org" Subject: Re: linuxppc_2_4_devel on walnut References: <3BDD855B.8D3FC72F@inn.ericsson.se> <3BE971BC.34591FF1@inn.ericsson.se> <3BEBF4E5.B60BD9E3@inn.ericsson.se> <3BF2A361.5FBB0246@mvista.com> <3BF4041F.A732B099@inn.ericsson.se> <3BF4A2D4.5080302@embeddededge.com> Content-Type: text/plain; charset=iso-8859-1 Sender: owner-linuxppc-embedded@lists.linuxppc.org List-Id: Dan Malek wrote: > > Kenneth Johansson wrote: > > > But "time dd if=/dev/zero of=testing bs=1024k count=100" on a nfs mouted fs > > used to be 18s and is now 21s, a 16% slowdown not that I care much but still > > quite a large difference. > > What versions of kernels/drivers are you comparing? Do you do this > back-to-back with the same NFS server, or have you introduced more > variables into your testing? This is why specially prepared network > performance testers are better suited for discussion. This was to the same nfs server on a live network. I did the test only two times on the first kernel version that was checke out a few hours before the mail was posted last friday. This was not done to benchmark anything but a way for me to verify what speed the networks was using 10/100 Mb was at the time reported wrong by the driver. The reason I run it twice was that I thougt 5,5MB/s was not so great but the second run had the same number. Then I upgraded the tree to a version that had Armin Kusters changes and just for fun run the test again. If I test only tcp/ip over the network I now get this.. ---- walnut:/tmp# time dd if=/dev/zero bs=1024k count=100 | nc -q0 9 100+0 records in 100+0 records out real 0m14.838s user 0m0.370s sys 0m14.380s --- 6,7Mb/s If I do the same from a intel 400MHz kernel 2.2.20 I get --- [innkeon@spawn innkeon]$time dd if=/dev/zero bs=1024k count=100 | nc -q0 9 100+0 records in 100+0 records out real 0m12.838s user 0m0.110s sys 0m1.890s --- 7,8 MB/s hmm funny the difference is also 16% (nc is the netcat program.) -- Kenneth Johansson Ericsson Business Innovation AB Tel: +46 8 404 71 83 Viderögatan 3 Fax: +46 8 404 72 72 164 80 Stockholm kenneth.johansson@inn.ericsson.se ** Sent via the linuxppc-embedded mail list. See http://lists.linuxppc.org/