Date: Sun, 18 Jan 2015 13:11:15 +0100 From: Harald Schmalzbauer <h.schmalzbauer@omnilan.de> To: FreeBSD Stable <freebsd-stable@freebsd.org> Subject: sonewconn: pcb =?UTF-8?B?MHjigKY6IExpc3RlbiBxdWV1ZSBvdmVyZmxvdyBb?= =?UTF-8?B?V2FzOiBSZTogbGFnZyg4KSBjYXVzZXMgZ2hvc3QgcXVldWUgd2l0aCBpZ2IoNCk=?= =?UTF-8?B?XQ==?= Message-ID: <54BBA2E3.5070401@omnilan.de> In-Reply-To: <54B962A3.9010308@omnilan.de> References: <54B962A3.9010308@omnilan.de>
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[-- Attachment #1 --] Bezüglich Harald Schmalzbauer's Nachricht vom 16.01.2015 20:12 (localtime): > Hi all, > > while investigating a watchdog timeout problem (on FreeBSD-10.1-stable > r276295) I noticed "ghost" queues consuming interrupts with > igb(4)[82576] if igb(4) is member of lagg(4) (laggproto loadbalance > lagghash l2). Mysteriously only sometimes (1 of 2 runs). > > Sending machine has only one ssh session open, where I do the following: > 'dd if=/dev/zero | nc vegashare 3333' (of course on vegashare is a > listener [nc -l vegashare 3333 > /dev/null]) > > I'm transfering 123.5*10^6 Bytes/sec and on the sender, systat reports: > 2682 igb0:que 0 (1 of 4 queues causes moderate irq load hw.igb.aim=1, > otherhise it were 16k irqs/s, nothing on the other 3 queues) > > But roughly every second run, I see a another queue consuming much more > irqs/s while transferring exactly the same at exactly the same speed: > 7740 igb0:que 0 > 2640 igb0:que 3 > > Here's again one queue with 2.6k irqs/s, but another one with 7.7k > irqs/s which I can't understand what this is doing. It's useless for > sure, because with only one queue I get the same payload transported on > the same hardware with the same speed and 3 queues idle… I noticed another mysterium, at least for me. I'd highly appreciate if somebody could give me a hint how I can understand the following lines sonewconn: pcb 0xfffff801b85907a8: Listen queue overflow: 151 already in queue awaiting acceptance (1 occurrences) sonewconn: pcb 0xfffff801b85907a8: Listen queue overflow: 151 already in queue awaiting acceptance (220 occurrences) I have never seen them before and I guess it's related to my other queue mysterium. They occured not during tests, so not during artificial (high) load, but regular low avarage load. Thanks in advance, -Harry [-- Attachment #2 --] -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.18 (FreeBSD) iEYEARECAAYFAlS7ouMACgkQLDqVQ9VXb8jl2wCgkdntdxgfNqTmlXLAiGrkmfSN F4YAni7QGhDwzZBaPgzpcI+VdFpxUCHc =ga9+ -----END PGP SIGNATURE-----help
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