Date: Thu, 11 May 2006 02:37:12 GMT From: Joseph Terner <jtsn@gmx.de> To: freebsd-gnats-submit@FreeBSD.org Subject: kern/97116: sis(4): low TCP throughput and abnormal delays with manual media selection Message-ID: <200605110237.k4B2bCuV096131@www.freebsd.org> Resent-Message-ID: <200605110240.k4B2e9jS090841@freefall.freebsd.org>
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>Number: 97116 >Category: kern >Synopsis: sis(4): low TCP throughput and abnormal delays with manual media selection >Confidential: no >Severity: non-critical >Priority: low >Responsible: freebsd-bugs >State: open >Quarter: >Keywords: >Date-Required: >Class: sw-bug >Submitter-Id: current-users >Arrival-Date: Thu May 11 02:40:09 GMT 2006 >Closed-Date: >Last-Modified: >Originator: Joseph Terner >Release: 5.4-RELEASE >Organization: >Environment: FreeBSD xylex 5.4-RELEASE-p1 FreeBSD 5.4-RELEASE-p1 #0: Wed May 18 02:50:23 CEST 2005 root@xylex:/usr/obj/usr/src/sys/GENERIC i386 >Description: dmesg(8) output: sis0: <SiS 900 10/100BaseTX> port 0xdc00-0xdcff mem 0xcfffd000-0xcfffdfff irq 10 at device 3.0 on pci0 miibus0: <MII bus> on sis0 rlphy0: <RTL8201L 10/100 media interface> on miibus0 rlphy0: 10baseT, 10baseT-FDX, 100baseTX, 100baseTX-FDX, auto Using manual media selection (100baseTX/FDX) causes TCP throughput to drop to about 1-5 MBit/s. There seems to be no packet-loss, but abnormal delays show up if the host is pinged during the TCP transfer: PING 192.168.5.6 (192.168.5.6): 56 data bytes 64 bytes from 192.168.5.6: icmp_seq=0 ttl=64 time=0.174 ms 64 bytes from 192.168.5.6: icmp_seq=1 ttl=64 time=0.170 ms 64 bytes from 192.168.5.6: icmp_seq=2 ttl=64 time=0.195 ms 64 bytes from 192.168.5.6: icmp_seq=3 ttl=64 time=29.269 ms 64 bytes from 192.168.5.6: icmp_seq=4 ttl=64 time=0.164 ms 64 bytes from 192.168.5.6: icmp_seq=5 ttl=64 time=0.193 ms 64 bytes from 192.168.5.6: icmp_seq=6 ttl=64 time=629.664 ms 64 bytes from 192.168.5.6: icmp_seq=7 ttl=64 time=0.189 ms 64 bytes from 192.168.5.6: icmp_seq=8 ttl=64 time=0.168 ms 64 bytes from 192.168.5.6: icmp_seq=9 ttl=64 time=0.189 ms 64 bytes from 192.168.5.6: icmp_seq=10 ttl=64 time=709.360 ms 64 bytes from 192.168.5.6: icmp_seq=11 ttl=64 time=0.213 ms 64 bytes from 192.168.5.6: icmp_seq=12 ttl=64 time=0.192 ms 64 bytes from 192.168.5.6: icmp_seq=13 ttl=64 time=489.767 ms 64 bytes from 192.168.5.6: icmp_seq=14 ttl=64 time=989.519 ms 64 bytes from 192.168.5.6: icmp_seq=15 ttl=64 time=0.192 ms 64 bytes from 192.168.5.6: icmp_seq=16 ttl=64 time=0.193 ms 64 bytes from 192.168.5.6: icmp_seq=17 ttl=64 time=369.145 ms 64 bytes from 192.168.5.6: icmp_seq=18 ttl=64 time=449.103 ms 64 bytes from 192.168.5.6: icmp_seq=19 ttl=64 time=0.192 ms 64 bytes from 192.168.5.6: icmp_seq=20 ttl=64 time=718.485 ms 64 bytes from 192.168.5.6: icmp_seq=21 ttl=64 time=0.173 ms 64 bytes from 192.168.5.6: icmp_seq=22 ttl=64 time=0.198 ms 64 bytes from 192.168.5.6: icmp_seq=23 ttl=64 time=0.179 ms 64 bytes from 192.168.5.6: icmp_seq=24 ttl=64 time=0.196 ms 64 bytes from 192.168.5.6: icmp_seq=25 ttl=64 time=0.189 ms 64 bytes from 192.168.5.6: icmp_seq=26 ttl=64 time=809.865 ms 64 bytes from 192.168.5.6: icmp_seq=27 ttl=64 time=0.158 ms 64 bytes from 192.168.5.6: icmp_seq=28 ttl=64 time=1.640 ms 64 bytes from 192.168.5.6: icmp_seq=29 ttl=64 time=0.175 ms 64 bytes from 192.168.5.6: icmp_seq=30 ttl=64 time=219.603 ms 64 bytes from 192.168.5.6: icmp_seq=31 ttl=64 time=990.000 ms 64 bytes from 192.168.5.6: icmp_seq=32 ttl=64 time=0.299 ms 64 bytes from 192.168.5.6: icmp_seq=33 ttl=64 time=289.938 ms ^C --- 192.168.5.6 ping statistics --- 34 packets transmitted, 34 packets received, 0% packet loss round-trip min/avg/max/stddev = 0.158/197.040/990.000/317.248 ms >How-To-Repeat: Configure a sis(4)-Interface to use manual media selection: # ifconfig sis0 media 100baseTX mediaopt full-duplex Then do a TCP transfer using fetch(1) or something similar. >Fix: Use media autoselection: # ifconfig sis0 media autoselect >Release-Note: >Audit-Trail: >Unformatted:
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