(originally filed as a bug in Fedora's bugzilla, see https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=171933) Greetings, Using Fedora Core 4 on a Dell PE 420sc. Malfunctioning kernel is smp-2.6.13-1.1532_FC4. Properly functioning kernels included smp-2.6.12-1.1456_FC4. Network performance is extremely poor when using bridged network interfaces. When not using brctl, the interface gives ~800kbps. When using brctl to bridge two interfaces, the speed drops to ~1.0kbps. Reverting to kernel-smp-2.6.12-1.1456_FC4 returns the speed to normal. The two interfaces have IP addresses when not bridged. They do not have IP addresses when they are bridged. (As expected.) No unusual output in dmesg. Traffic is not slowed that originates on a bridge interfaces and goes out a bridge interface, only traffic from the host that the bridge is on, is slowed. Making these connections unbridged returns normal traffic performance. Reverting to 2.6.12 also returns normal performance. Tcpdump indicates increasing pauses returning packets. (From bridge host to the outside. Bridge host is a web server, though even SSH connections are slow.) For example: 14:25:53.387001 IP 192.168.0.1.https > 10.0.0.1.32752: tcp 1260 14:25:53.648768 IP 10.0.0.1.32752 > 192.168.0.1.https: tcp 0 14:25:53.648817 IP 192.168.0.1.https > 10.0.0.1.32752: tcp 1260 14:25:53.648859 IP 192.168.0.1.https > 10.0.0.1.32752: tcp 1260 14:25:53.770239 IP 10.0.0.1.32752 > 192.168.0.1.https: tcp 0 14:26:03.242674 IP 192.168.0.1.https > 10.0.0.1.32752: tcp 1260 14:26:03.462594 IP 10.0.0.1.32752 > 192.168.0.1.https: tcp 0 14:26:03.462675 IP 192.168.0.1.https > 10.0.0.1.32752: tcp 1260 14:26:03.462714 IP 192.168.0.1.https > 10.0.0.1.32752: tcp 1260 14:26:03.581169 IP 10.0.0.1.32752 > 192.168.0.1.https: tcp 0 14:26:22.526025 IP 192.168.0.1.https > 10.0.0.1.32752: tcp 1260 14:26:22.784218 IP 10.0.0.1.32752 > 192.168.0.1.https: tcp 0 14:26:22.784325 IP 192.168.0.1.https > 10.0.0.1.32752: tcp 1260 14:26:22.784379 IP 192.168.0.1.https > 10.0.0.1.32752: tcp 1260 14:26:22.895638 IP 10.0.0.1.32752 > 192.168.0.1.https: tcp 0 14:27:00.780762 IP 192.168.0.1.https > 10.0.0.1.32752: tcp 1260 14:27:01.045112 IP 10.0.0.1.32752 > 192.168.0.1.https: tcp 0 14:27:01.045209 IP 192.168.0.1.https > 10.0.0.1.32752: tcp 1260 14:27:01.045263 IP 192.168.0.1.https > 10.0.0.1.32752: tcp 1260 14:27:01.160083 IP 10.0.0.1.32752 > 192.168.0.1.https: tcp 0 (192.168.0.1 = bridge host, 10.0.0.1 = external host. This happened while trying to download a text file.) Any suggestions, or places to look for information, is appreciated. - Josh
