Date: Tue, 26 Feb 2008 21:51:25 +0100 (CET) From: Ingo Flaschberger <if@xip.at> To: Dave Raven <dave@raven.za.net> Cc: freebsd-net@freebsd.org Subject: RE: Hping/Ping Message-ID: <alpine.LFD.1.00.0802262136550.17127@filebunker.xip.at> In-Reply-To: <040401c878b2$eac6fb80$c054f280$@za.net> References: <03cb01c8789b$04aade30$0e009a90$@za.net> <alpine.LFD.1.00.0802261831490.17127@filebunker.xip.at> <03cf01c8789e$f15b0860$d4111920$@za.net> <alpine.LFD.1.00.0802261848010.17127@filebunker.xip.at> <03d001c878a0$bf3d8680$3db89380$@za.net> <alpine.LFD.1.00.0802261902560.17127@filebunker.xip.at> <03de01c878a3$90cc7560$b2656020$@za.net> <alpine.LFD.1.00.0802261920440.17127@filebunker.xip.at> <03e501c878a5$588f1c50$09ad54f0$@za.net> <alpine.LFD.1.00.0802261930300.17127@filebunker.xip.at> <03e601c878a6$87380980$95a81c80$@za.net> <alpine.LFD.1.00.0802261940340.17127@filebunker.xip.at> <03ef01c878a9$8aa08180$9fe18480$@za.net> <alpine.LFD.1.00.0802262020320.17127@filebunker.xip.at> <03f901c878ac$ea20df30$be629d90$@za.net> <alpine.LFD.1.00.0802262027270.17127@filebunker.xip.at> <040401c878b2$eac6fb80$c054f280$@za.net>
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Dear Dave, > intr_queue_drops was rising very quickly, after changing queue_maxlen to 500 > (from 50) the problems all went away. What's a reasonable value for that for > a high load box (5000+ interrupts a second) ? http://devwiki.pfsense.org/Tuning?show_comments=1 they set it to 3000 intel em-cards have a buffer of max. 4096 some more talks & tuning: http://osdir.com/ml/freebsd.devel.net/2002-10/msg00072.html http://osdir.com/ml/freebsd.devel.net/2002-10/msg00104.html > Also, while over a 1000 pings have gone through fine now, a minute or two > after I made the change I saw this -- > > 64 bytes from x.x.x.x: icmp_seq=25 ttl=255 time=0.465 ms > ping: sendto: No buffer space available > ping: sendto: No buffer space available > ping: sendto: No buffer space available > ping: sendto: No buffer space available > ping: sendto: No buffer space available > ping: sendto: No buffer space available > ping: sendto: No buffer space available > 64 bytes from x.x.x.x: icmp_seq=35 ttl=255 time=0.294 ms > > It hasn't happened again (and I hope it doesn't) - but is that something I > should look for? try todo a netstat -m when you get the buffer errors. and increase: net.inet.tcp.sendspace just to be shure, you have a 1000mbit link? Kind regards, Ingo Flaschberger
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