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Date: Thu, 24 Mar 2011 10:00:05 GMT
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To: freebsd-net@FreeBSD.org
From: Vladimir Kutakov <vova@ashmanov.com>
Cc: 
Subject: Re: kern/155597: [panic] Kernel panics with "sbdrop" message
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The following reply was made to PR kern/155597; it has been noted by GNATS.

From: Vladimir Kutakov <vova@ashmanov.com>
To: bug-followup@FreeBSD.org, vova@ashmanov.com
Cc:  
Subject: Re: kern/155597: [panic] Kernel panics with "sbdrop" message
Date: Thu, 24 Mar 2011 12:35:34 +0300

 We are looking into this problem a bit. The panic is reproducible easily by means of big http trafic. We ran apache benchmark on 3 next servers: ab -c40 -n20000000 'http://thehost/somesmallfile'. After just some minutes panic occurs.
 
 However, after decreasing hw.igb.num_queues to 4 (default value is 8), it occurs only after 2 hours.
 
 Finally, the server with hw.igb.num_queues=1 works good already 7 days.
 
 It seems that some problem happens during parallel tcp processing.
 
 
 -- 
 WBR,
 Vladimir
 mailto:vova@ashmanov.com