From mboxrd@z Thu Jan 1 00:00:00 1970 From: Carl-Daniel Hailfinger Date: Fri, 22 Jul 2005 15:28:10 +0000 Subject: Re: [LARTC] Latency of Linux Bridge Message-Id: <42E1108A.1020404@gmx.net> List-Id: References: In-Reply-To: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: lartc@vger.kernel.org Hi, Christian Konecny (VI/SEA) schrieb: > I just recognized, that a basic bridge just with it's > minumum configuration of 2 network interfaces creates > latency of approx. 5ms on very low traffic. > This seems to be independent on CPU speed. I tried on > 2 GHz PC while having just 64kBit traffic with packet > size of about 300bytes. That's strange. On my bridge with 4 network interfaces, the additional latency is always below 0.5 ms, even if I'm pushing 400 MBit/s through the machine and a kernel compile is running at 100% CPU. Network interfaces are PCIe GBit from Syskonnect, the machine is an Athlon64 at 2 GHz. Even if the clock speed is halved by powersave the additional latency will not go above 0.9 ms. Kernel is vanilla 2.6.11.x. Regards, Carl-Daniel -- http://www.hailfinger.org/ _______________________________________________ LARTC mailing list LARTC@mailman.ds9a.nl http://mailman.ds9a.nl/cgi-bin/mailman/listinfo/lartc