Re: snmpd creating dirty buffers on a D-Link DFE-580TX

On Tue, 18 Dec 2007 14:39:07 +0100
Thomas Anders <[email protected]> wrote:

> richard lucassen wrote:
> >> I use a quad ethernet card D-Link DFE-580TX in my server. As soon
> >as I > start snmpd I get this in syslog:
> >>
> >> kernel: 00 39d52000 00000000 00000000(00) 00000000 00000000
> >> [snip bunch of messages like above]
> >> kernel: TxListPtr=39d00150 netif_queue_stopped=0
> >> kernel: cur_tx=3126(16) dirty_tx=3126(16)
> >> kernel: cur_rx=20 dirty_rx=20
> >> kernel: cur_task=3126
> >> kernel: TxStatus=1500
> > 
> > I just installed sndmp (also Debian Etch net-snmpd-5.2.3) on
> > different hardware (DL320) with the same D-Link networkcard and I
> > get exactly the same messages.
> 
> Sounds like a kernel problem that just happens to get *triggered* by
> snmpd. You may want to run snmpd under "strace" to find out what exact
> system call triggers the message. Is it just syslog noise or are you
> seeing any real problems?

Just syslog noise. I replaced the card with chipsets DL10050D by a
DL10050C, but nothing changed. This is what I see using strace:

[snip]
mprotect(0x2b4221749000, 86016, PROT_READ) = 0
arch_prctl(ARCH_SET_FS, 0x2b4221d11e00) = 0
munmap(0x2b42208cc000, 25026)           = 0
getrlimit(RLIMIT_NOFILE, {rlim_cur=1024, rlim_max=1024}) = 0
close(1023)                             = -1 EBADF (Bad file descriptor)
close(1022)                             = -1 EBADF (Bad file descriptor)
close(1021)                             = -1 EBADF (Bad file descriptor)
close(1020)                             = -1 EBADF (Bad file descriptor)
[snip many lines like above]

Full versions are here:



http://www.xaq.nl/divers/strace

strace -o /ff/strace-f snmpd -Lsd -Lf /dev/null -u snmp -I -smux -p
/var/run/snmpd.pid 127.0.0.1



http://www.xaq.nl/divers/strace-f

strace -f -o /ff/strace-f snmpd -Lsd -Lf /dev/null -u snmp -I -smux -p
/var/run/snmpd.pid 127.0.0.1

I'm not a programmer unfortunately, so I can't get any futher than
running some tests.

R.

-- 
___________________________________________________________________
It is better to remain silent and be thought a fool, than to speak
aloud and remove all doubt.

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| Richard Lucassen, Utrecht                                        |
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