Date: Tue, 21 Nov 2006 21:47:09 -0500 From: Mike Tancsa <mike@sentex.net> To: freebsd-performance@freebsd.org Subject: Re: em forwarding performance (was Proposed 6.2 em RELEASE patch Message-ID: <200611220247.kAM2l9JP095066@lava.sentex.ca> In-Reply-To: <7.1.0.9.0.20061120160757.14d4a728@sentex.net> References: <2a41acea0611081719h31be096eu614d2f2325aff511@mail.gmail.com> <200611091536.kA9FaltD018819@lava.sentex.ca> <45534E76.6020906@samsco.org> <200611092200.kA9M0q1E020473@lava.sentex.ca> <200611102004.kAAK4iO9027778@lava.sentex.ca> <2a41acea0611101400w5b8cef40ob84ed6de181f3e2c@mail.gmail.com> <200611102221.kAAML6ol028630@lava.sentex.ca> <455570D8.6070000@samsco.org> <200611120412.kAC4CuIB035746@lava.sentex.ca> <45574ECA.4080207@samsco.org> <200611130040.kAD0etbp040637@lava.sentex.ca> <4557CECD.2000609@samsco.org> <200611130158.kAD1wdKE040908@lava.sentex.ca> <4557EF13.9060305@samsco.org> <200611130454.kAD4sZwe041556@lava.sentex.ca> <4557FF7A.8020704@samsco.org> <200611132054.kADKsFvK045726@lava.sentex.ca> <4558E3DC.6080800@samsco.org> <200611200454.kAK4sdat083568@lava.sentex.ca> <7.1.0.9.0.20061120160757.14d4a728@sentex.net>
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At 12:50 AM 11/21/2006, Mike Tancsa wrote: >The table is also up at http://www.tancsa.com/blast.html which might >be easier to read Decided to test with RELENG_4 as a comparison. Quite a difference. With polling and fast forwarding on, I can use 2 routers to blast through at almost 1Mpps. Even with ipfw loaded, it performs as RELENG_6 and above does without ipfw. Updated stats in the table at the above URL. One other aspect I have not looked at yet are some of the compile time tunables for em. Looking at the stats from the dual port em nic below, does anyone have any suggestions on what to adjust ? This is a PCIe dual port Pro 1000 PT. em0: Excessive collisions = 0 em0: Symbol errors = 0 em0: Sequence errors = 0 em0: Defer count = 0 em0: Missed Packets = 271924 em0: Receive No Buffers = 1662344 em0: Receive Length Errors = 0 em0: Receive errors = 0 em0: Crc errors = 0 em0: Alignment errors = 0 em0: Carrier extension errors = 0 em0: RX overruns = 0 em0: watchdog timeouts = 0 em0: XON Rcvd = 0 em0: XON Xmtd = 149 em0: XOFF Rcvd = 0 em0: XOFF Xmtd = 272047 em0: Good Packets Rcvd = 175954557 em0: Good Packets Xmtd = 28676200 em1: Excessive collisions = 0 em1: Symbol errors = 0 em1: Sequence errors = 0 em1: Defer count = 0 em1: Missed Packets = 58484 em1: Receive No Buffers = 56645 em1: Receive Length Errors = 0 em1: Receive errors = 0 em1: Crc errors = 0 em1: Alignment errors = 0 em1: Carrier extension errors = 0 em1: RX overruns = 0 em1: watchdog timeouts = 0 em1: XON Rcvd = 0 em1: XON Xmtd = 589 em1: XOFF Rcvd = 0 em1: XOFF Xmtd = 59073 em1: Good Packets Rcvd = 28676216 em1: Good Packets Xmtd = 175954480 ---Mike
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