Date: Fri, 25 Feb 2000 13:00:30 -0800 (PST) From: smaff@arbitrary.clues.com To: freebsd-gnats-submit@FreeBSD.org Subject: kern/16992: Low throughput of tcp sessions between "pn" cards Message-ID: <200002252100.NAA28027@freefall.freebsd.org>
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>Number: 16992 >Category: kern >Synopsis: Low throughput of tcp sessions between "pn" cards >Confidential: no >Severity: non-critical >Priority: medium >Responsible: freebsd-bugs >State: open >Quarter: >Keywords: >Date-Required: >Class: sw-bug >Submitter-Id: current-users >Arrival-Date: Fri Feb 25 13:10:00 PST 2000 >Closed-Date: >Last-Modified: >Originator: Andrew Matthews >Release: 3.4-RELEASE >Organization: - >Environment: FreeBSD router 3.4-RELEASE FreeBSD 3.4-RELEASE #0: Tue Jan 1 03:10:49 GMT 1980 root@:/usr/src/sys/compile/ROUTER i386 >Description: We have a router with 2 Netgear FA310TX (pn0 & pn1) cards, and a 3COM 3c509 card. The pn's are both in 100MB Full Duplex, and the two test machines are plugged into this via 100MB FD switching hubs (the Netgear FS108), they also use FA310TX and are 3.4 and 3.3 release boxes. The 3com card is 10mb Half Duplex. Test machine A is in pn0, and Test machine B connects via pn1. Throughput testing using ping -f and "bing" indicates all is well - bing gives around 40Mbits/s between B & A, and about 5MBits/s between B and the next hop out of the 3com card. However, while attempting to shift files around using ftp gives the following results: B getting large file via ep0 : 624Kbytes/s A getting large file via ep0 : 622Kbytes/s B getting large file from A : 160Kbytes/s B getting large file from A (pn1 in Half Duplex): 500Kbytes/s (v.variable) (note, the pn cards are nailed, not autoselecting - so extra problem there as it seems the switch seems to think its half-duplex regardless of the card's setting - maybe a switch problem though there). Also, during A->B transfer, the statistics are very bursty, with moments of relatively low transfer intersped with high, compared with via ep0 transfers which are fairly steady. There are no observable error messages (except when pn1 is in full-duplex netstat does report the odd errored packet, which is what you'd expect if the switch thought it was half-duplex). Other info: Timecounter "i8254" frequency 1193182 Hz Timecounter "TSC" frequency 99126478 Hz CPU: Pentium/P54C (99.13-MHz 586-class CPU) Origin = "GenuineIntel" Id = 0x525 Stepping = 5 Features=0x1bf<FPU,VME,DE,PSE,TSC,MSR,MCE,CX8> real memory = 67108864 (65536K bytes) pn0: <82c169 PNIC 10/100BaseTX> rev 0x20 int a irq 9 on pci0.17.0 pn1: <82c169 PNIC 10/100BaseTX> rev 0x20 int a irq 15 on pci0.20.0 ep0 at 0x230-0x23f irq 10 on isa (no theres no wdc1) No idea if the "int a" being the same makes a difference, or even how to change it if it does. >How-To-Repeat: Fairly consistant. Just ftp things. >Fix: Don't use 2 FA310TX cards in the same box (suggested by netgear techsupport) - Not entirely a "solution" but there you go :/ >Release-Note: >Audit-Trail: >Unformatted: To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-bugs" in the body of the message
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