UDP packet loss
Pavel Urban
urbanp at mlp.cz
Sat Jun 10 09:04:06 UTC 2006
JINMEI Tatuya / ???? wrote:
>>>>>> On Thu, 08 Jun 2006 16:01:18 +0200,
>>>>>> Pavel Urban <urbanp at mlp.cz> said:
>
>> I've tried to find out the cause of some strange resolving problem we
>> are experiencing. From time to time, our server seems to ignore some
>> requests, while others are answered promptly. It seems to me that the
>> problem is UDP packet loss.
>
>> Udp:
>> 948795842 packets received
>> 149802 packets to unknown port received.
>> 214635022 packet receive errors
>> 1003702082 packets sent
>
>> I've tried to increase system udp receive buffer 10x and then 100x with
>> no noticable effect. Do I have to change something in Bind, too? Or am I
>> completely wrong?
>
>> RedHat Linux ES release 4, 2.6.9-34.ELsmp kernel, dual Opteron system
>> with 6GB ram, no local zones, just resolver/cache. bind-9.3.2-2_EL4
>
> A quick question: did you enable threads?
>
As far as I know, RedHat's packages are compiled with threads enabled.
This server is quite busy, about 4MBit of DNS traffic for hours...
--
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Pavel Urban (pavel.urban at imaginet.cz)
IOL system disaster
Internet OnLine, owned by Cesky Telecom, a.s. (www.ct.cz)
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Vegetables should not operate electronic equipment.
Computer Stupidities, http://rinkworks.com/stupid/
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