Questions about DNS performance
Joaquin J. Domens
jdomens at corp.terra.es
Tue Feb 18 10:23:37 UTC 2003
Hi all,
I work for a Spanish ISP and we're experimenting some problems at the
peek hour (18:00 european time) as I get all my servers at 90% of cpu
usage.
I would like to know wheter this is normal or not.
We're running BIND 8.3.4 on 4 solaris boxes (NetraT1) with 512 MB RAM
each one. DNS is splitted so this boxes are without any authoritative
zones, they running just BIND.
This boxes are under a LB with round robin blancing.
The statistics during the day are something like this ....
#netstat -I hme1 1 =20
input hme1 output input (Total) output
packets errs packets errs colls packets errs packets errs colls=20
563 0 590 0 0 565 0 591 0 0 =20
521 0 719 0 0 523 0 721 0 0 =20
509 0 550 0 0 511 0 552 0 0 =20
484 0 588 0 0 494 0 598 0 0 =20
564 0 637 0 0 566 0 639 0 0 =20
549 0 606 0 0 551 0 608 0 0 =20
543 0 665 0 0 546 0 668 0 0 =20
547 0 637 0 0 549 0 639 0 0 =20
545 0 555 0 0 547 0 557 0 0 =20
535 0 593 0 0 537 0 595 0 0 =20
648 0 779 0 0 650 0 781 0 0 =20
549 0 688 0 0 551 0 690 0 0 =20
And with this output of the interface the CPU load it's about 60% ....
PID USERNAME THR PRI NICE SIZE RES STATE TIME CPU COMMAND
24909 root 1 30 0 295M 291M run 75.9H 61.18% named
With this escenario we're about 90% of CPU at the peak hour.
In the LB output traffic in the peak hour it's about 6 MB of bandwidth.
Do yuo guys think this is a normal behaviour for the configuration
showed or you think It could be due some misconfigurations ?
I mean, I think they are serving according to the traffic, maybe we will
need more RAM or boxes to serve it correctly, but I don't know what a
system with this kind of load should be running.
Is anyone running BIND in large systems as here ?
TIA
--
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Joaquin J. Domens
=C1rea de Tecnolog=EDa
Departamento de Producci=F3n / Aplicaciones
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Terra Networks Espa=F1a S.A.
Via dos Castillas 7, Pozuelo de Alarc=F3n
Madrid, Espa=F1a
Tel. (34) 91-452-33-71
joaquin.domens at corp.terra.es
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