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<DIV class=OutlookMessageHeader lang=en-us dir=ltr align=left><FONT
face=Tahoma size=2>-----Original Message-----<BR><B>From:</B>
centos-bounces@centos.org [mailto:centos-bounces@centos.org] <B>On Behalf Of
</B>chloe K<BR></FONT></DIV>
<DIV>i all<BR><BR>I use linux as GiGE router and have 6 NIC on it<BR>Those
days the NIC interrupt takes around 100% CPU but the system is 4G memroy and 8
CPU. I can't see any error packet in this NIC interface too<BR><BR>After I
block the udp, the %CPU drops. but the UDP only takes around 8M in
general<BR><SPAN class=770373213-11102007><FONT face=Arial color=#0000ff
size=2> </FONT></SPAN></DIV>
<DIV><SPAN class=770373213-11102007></SPAN> </DIV>
<DIV><SPAN class=770373213-11102007><FONT face=Arial color=#0000ff size=2>Is
there any chance you have a routing loop problem? when your CPU jumps to 100%
usage, is traffic still passing, and your applications working? (I am also
assuming that all 8CPU's are at 100% usage)</FONT></SPAN></DIV>
<DIV><SPAN class=770373213-11102007><FONT face=Arial color=#0000ff
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=770373213-11102007><FONT face=Arial color=#0000ff size=2>are
you blocking the UDP traffic with iptables on your linux box? if so...maybe
set it to be a log rule instead, then analyze those logs.</FONT></SPAN></DIV>
<DIV><SPAN class=770373213-11102007><FONT face=Arial color=#0000ff
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=770373213-11102007><FONT face=Arial color=#0000ff size=2>as a
side note, when your interrupts are taking 100% CPU...it is called "Live Lock"
(in case you didn't know)</FONT></SPAN></DIV>
<DIV><SPAN class=770373213-11102007><FONT face=Arial color=#0000ff
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=770373213-11102007><FONT face=Arial color=#0000ff
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=770373213-11102007> </SPAN><BR>We use UDP traffic for
voice.<BR><BR>Do you have any suggestion ? increase the kernel
parameter?<BR><SPAN class=770373213-11102007><FONT face=Arial color=#0000ff
size=2> </FONT></SPAN></DIV>
<DIV><SPAN class=770373213-11102007><FONT face=Arial color=#0000ff size=2>I
take it that there was no interesting information in 'dmesg' as
well.</FONT></SPAN></DIV>
<DIV><SPAN class=770373213-11102007></SPAN> </DIV>
<DIV><SPAN class=770373213-11102007><FONT face=Arial color=#0000ff
size=2>Mike</FONT> </SPAN></DIV></BLOCKQUOTE></BODY></HTML>