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Date:      Sat, 24 Jan 2009 16:20:06 +0000
From:      Rui Paulo <rpaulo@freebsd.org>
To:        Yony Yossef <yonyossef.lists@gmail.com>
Cc:        johan@nocrew.org, freebsd-net@freebsd.org, Eitan Shefi <eitans@mellanox.co.il>, Amit Krig <amitk@mellanox.co.il>, Liran Liss <liranl@mellanox.co.il>
Subject:   Re: freebsd 7.0-RELEASE BUG ping: sendto: No buffer space available
Message-ID:  <EDD4152E-8BE7-40C3-A153-21A110152BE8@freebsd.org>
In-Reply-To: <000001c97e23$0d81df20$39ed1aac@mtl.com>
References:  <000001c97e23$0d81df20$39ed1aac@mtl.com>

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On 24 Jan 2009, at 12:54, Yony Yossef wrote:

> Hi All,
>
> I'm facing a temporary network hang on my interfaces following a flood
> ping/stress udp test.
>
> I'm running a netperf UDP test which is giving results but does not  
> return
> to the shell.
> client output:
>
> UDP UNIDIRECTIONAL SEND TEST from fe80::202:c9ff:fe02:e1fe%mtnic0
> (fe80::202:c9ff:fe02:e1fe) port 0 AF_INET6 to  
> fe80::202:c9ff:fe02:e1f4%mt
> nic0 (fe80::202:c9ff:fe02:e1f4) port 0 AF_INET6
> Socket  Message  Elapsed      Messages
> Size    Size     Time         Okay Errors   Throughput
> bytes   bytes    secs            #      #   10^6bits/sec
>
> 32768    1472   10.02      547428 1694280     643.60
> 32768           10.02       25089             29.50
>
>
> (HANG)
>
> After a minute or two it returns to the shell with the following  
> message:
> shutdown_control: no response received  errno 55
>
> 20 minutes later (!!) the interface is working again.
>
> netstat -m and vmstat -z outputs during the hang time:
>
> # netstat -m
> 25687/6578/32265 mbufs in use (current/cache/total)
> 17404/2438/19842/65536 mbuf clusters in use (current/cache/total/max)
> 0/1024 mbuf+clusters out of packet secondary zone in use (current/ 
> cache)
> 2071/1369/3440/65536 4k (page size) jumbo clusters in use
> (current/cache/total/max)
> 0/0/0/65536 9k jumbo clusters in use (current/cache/total/max)
> 0/0/0/3200 16k jumbo clusters in use (current/cache/total/max)
> 49513K/11996K/61510K bytes allocated to network (current/cache/total)
> 0/0/0 requests for mbufs denied (mbufs/clusters/mbuf+clusters)
> 0/0/0 requests for jumbo clusters denied (4k/9k/16k)
> 0/0/0 sfbufs in use (current/peak/max)
> 0 requests for sfbufs denied
> 0 requests for sfbufs delayed
> 0 requests for I/O initiated by sendfile
> 0 calls to protocol drain routines

I think there are too many mbufs in use. You're probably facing an  
mbuf leakage and that causes an interface hang.

--
Rui Paulo




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