Date: Tue, 20 Feb 2007 17:27:02 -0500 From: Andre Guibert de Bruet <andy@siliconlandmark.com> To: Andrew Gallatin <gallatin@cs.duke.edu> Cc: current@freebsd.org Subject: Re: excessive TCP duplicate acks? Message-ID: <DF12957F-D92B-495A-A815-2F5ECFD83852@siliconlandmark.com> In-Reply-To: <17883.19584.99616.808623@grasshopper.cs.duke.edu> References: <17850.13146.266196.499166@grasshopper.cs.duke.edu> <2FE2BC67-A829-4BF9-B606-65DE1393E8DE@siliconlandmark.com> <17883.19584.99616.808623@grasshopper.cs.duke.edu>
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On Feb 20, 2007, at 2:31 PM, Andrew Gallatin wrote: > Thanks for reporting this. I'm glad I'm not the only one who is > seeing this! I discovered this while testing out a new multi-homed bonded-T1 installation. I was wondering why I was getting no more than ~170KB/ s. So far, here are the data points that I have gathered: - It affects more than one type of NIC (em0). - It happens regardless of hardware checksum enabled status. - It happens independent of IP aliasing. - I tested GENERIC as of Feb 19 and it is affected. - A kernel from December 15th, 2006 exhibits this problem. - The affected system is connected to a Linksys 24-port unmanaged gigabit switch (I have the exact same hardware working just fine with 5.5-STABLE on the same switch). dmesg for -CURRENT system: http://bling.properkernel.com/freebsd/ dmesg.boot.txt Cheers, Andy /* Andre Guibert de Bruet * 6f43 6564 7020 656f 2e74 4220 7469 6a20 */ /* Code poet / Sysadmin * 636f 656b 2e79 5320 7379 6461 696d 2e6e */ /* GSM: +1 734 846 8758 * 5520 494e 2058 6c73 7565 6874 002e 0000 */ /* WWW: siliconlandmark.com * C/C++, Java, Perl, PHP, SQL, XHTML, XML */
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