gettimeofday() in hping
binto at triplegate.net.id
Wed Jan 23 23:29:10 PST 2008
> Steven Hartland wrote:
>> ----- Original Message ----- From: "Ivan Voras" <ivoras at freebsd.org>
>>>> The other thing that bothers me is, that under freebsd is quite easy
>>>> to get:
>>>> [send_ip] sendto: No buffer space available
>>>> It happens almost always on my laptop just few seconds after I start
>>>> hping with timecounter=TSC
>>> I'm not sure, but from what I understood of Robert Watson's
>>> explanation in the big ZFS thread on -current, maybe increasing
>>> kmem_size (exactly as for ZFS...) could help you with these buffers.
>> Is this not just running out of mbufs? netstat -m will show if it is
>> and the fix
>> is to just increase kern.ipc.nmbclusters.
> 670/1520/2190 mbufs in use (current/cache/total)
> 462/322/784/25600 mbuf clusters in use (current/cache/total/max)
> 462/306 mbuf+clusters out of packet secondary zone in use (current/cache)
> 0/35/35/12800 4k (page size) jumbo clusters in use
> 0/0/0/6400 9k jumbo clusters in use (current/cache/total/max)
> 0/0/0/3200 16k jumbo clusters in use (current/cache/total/max)
> 1091K/1164K/2255K 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)
> 0/4/6656 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
> kern.ipc.nmbclusters: 25600
sysctl -a kern.ipc.maxsockbuf ?
if net.inet.tcp.recvspace / net.inet.tcp.sendspace greater than
that can also make : "No buffer space available"
> I do not think I'm running out of mbufs.
> And increasing nmbclusters doesn't help.
> Here is what I have for kmem_size. How can I see how much of the kmem
> size is used ? vmstat -m :)
> vm.kmem_size_scale: 3
> vm.kmem_size_max: 335544320
> vm.kmem_size_min: 0
> vm.kmem_size: 335544320
> Something suspicious that I notice is:
> vmstat -m|grep devbuf
> devbuf 5214 42780K - 6390
> 42MB memory allocated for devbuf ? Is this ok ?
> This is the only thing that 'eat' more then 1-2MB memory reported by
> vmstat -m.
> Best Wishes,
> Stefan Lambrev
> ICQ# 24134177
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