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Date: Tue, 29 May 2012 16:50:08 GMT
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To: freebsd-bugs@FreeBSD.org
From: Ziyan Maraikar <ziyanm@gmail.com>
Cc: 
Subject: Re: amd64/168342: mbuf exhaustion hangs all daemons in keglimit
	state
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The following reply was made to PR kern/168342; it has been noted by GNATS.

From: Ziyan Maraikar <ziyanm@gmail.com>
To: John Baldwin <jhb@freebsd.org>
Cc: freebsd-amd64@freebsd.org,
 FreeBSD-gnats-submit@freebsd.org,
 Darshana Jayasinghe <darshana.jayasinghe@gmail.com>
Subject: Re: amd64/168342: mbuf exhaustion hangs all daemons in keglimit state
Date: Tue, 29 May 2012 22:14:02 +0530

 Hello John,
 
 Thanks for the response.
 >=20
 > Have you tried increasing kern.ipc.nmbclusters?  Alternatively, have =
 you tried=20
 > restricting igb to only using 1 queue?  It sounds like all your igb =
 interfaces=20
 > are allocating all of your mbuf clusters for their receive rings.
 >=20
 I found this very suggestion on several mailing list discussions [1] and =
 set these values on Saturday.
 kern.ipc.nmbclusters=3D"131072"
 hw.igb.num_queues=3D"2"
 So far everything seems to back to normal, and netstat -m shows plenty =
 of headroom now.=20
 
 The problem cropped up after running several months on 9.0-RELEASE when =
 I  brought up another interface. Disabling the new interface didn't =
 restore normal operation, however. I also tried 8.3-RELEASE but the =
 problem was worse on it.
 
 [1] http://osdir.com/ml/freebsd-stable/2012-02/msg00563.html
 __
 Regards
 Ziyan.=