Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S265586AbUAGPyo (ORCPT ); Wed, 7 Jan 2004 10:54:44 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S265600AbUAGPyo (ORCPT ); Wed, 7 Jan 2004 10:54:44 -0500 Received: from user-12hcje4.cable.mindspring.com ([69.22.77.196]:53420 "EHLO bender.davehollis.com") by vger.kernel.org with ESMTP id S265586AbUAGPym (ORCPT ); Wed, 7 Jan 2004 10:54:42 -0500 Subject: Re: Slow receive with AX8817 USB2 ethernet adapter From: David T Hollis To: =?ISO-8859-1?Q?M=E5ns_Rullg=E5rd?= Cc: linux-kernel@vger.kernel.org In-Reply-To: References: Content-Type: text/plain; charset= Message-Id: <1073490614.5634.31.camel@dhollis-lnx.kpmg.com> Mime-Version: 1.0 X-Mailer: Ximian Evolution 1.4.5 (1.4.5-8) Date: Wed, 07 Jan 2004 10:54:38 -0500 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2178 Lines: 55 On Wed, 2004-01-07 at 08:53, Måns Rullgård wrote: > mru@kth.se (Måns Rullgård) writes: > > > I'm getting very bad receive rates with a Netgear FA-120 USB2 Ethernet > > adapter under Linux 2.6.0. Timing an incoming TCP stream, I get only > > 600 kB/s. Sending works properly at 10 MB/s. I first reported this > > problem some time in July or August. Is it just me having this issue? > > Can I get any helpful information somehow? > Hmm, I am seeing the same results using ttcp: **** Send Results **** [root@dhollis-lnx dhollis]# ttcp -t -s -D -n 8192 192.168.5.1 ttcp-t: buflen=8192, nbuf=8192, align=16384/0, port=5001 tcp -> 192.168.5.1 ttcp-t: socket ttcp-t: nodelay ttcp-t: connect ttcp-t: 67108864 bytes in 7.89 real seconds = 8302.39 KB/sec +++ ttcp-t: 8192 I/O calls, msec/call = 0.99, calls/sec = 1037.80 ttcp-t: 0.0user 0.1sys 0:07real 1% 0i+0d 0maxrss 0+2pf 1118+151csw **** Receiving Results ***** [root@dhollis-lnx 2.6.0]# ttcp -r -s -D ttcp-r: buflen=8192, nbuf=2048, align=16384/0, port=5001 tcp ttcp-r: socket ttcp-r: accept from 192.168.5.1 ttcp-r: 16777216 bytes in 25.18 real seconds = 650.68 KB/sec +++ ttcp-r: 7385 I/O calls, msec/call = 3.49, calls/sec = 293.29 ttcp-r: 0.0user 0.1sys 0:25real 0% 0i+0d 0maxrss 0+2pf 10115+163csw [root@dhollis-lnx 2.6.0]# ttcp -r -s -D ttcp-r: buflen=8192, nbuf=2048, align=16384/0, port=5001 tcp ttcp-r: socket ttcp-r: accept from 192.168.5.1 ttcp-r: 67108864 bytes in 5.81 real seconds = 11276.03 KB/sec +++ ttcp-r: 42074 I/O calls, msec/call = 0.14, calls/sec = 7239.19 ttcp-r: 0.0user 0.4sys 0:05real 8% 0i+0d 0maxrss 0+2pf 41000+3667csw Notice that I was able to achieve 11MB/s at one point and I was able to repeat those results continually. I then unloaded the module, reloaded, re-ifconfigged and was back at the 600-700k mark. It's going to take some further debugging to fully trace this problem out. -- David T Hollis - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/