full socket buffers

sthaug at nethelp.no sthaug at nethelp.no
Sat Dec 18 20:08:38 UTC 2010

> we're running ISC DHCP 4.1.1p1 on FreeBSD 7.3-RELEASE box
> for about 30k hosts with various leasetime from 4 hours to 7 days.
> Time to time we experience significant performance loss while
> clients are unable to get a lease. In the time the UDP full socket
> buffer is constantly growing:
> How could I tell the cause of the full buffer socket?

How is your disk utilization? Good ISC DHCP performance is critically
dependent on good disk performance.

We're also running 4.1.1p1, on FreeBSD 7.3-STABLE. Server hardware is
Dell PE 1850, with two SCSI disks in a RAID-1 configuration. We have
around 100k leases on two servers in a failover pair, with most of the
pools on 24 hour leasetime. We don't see the problem you're seeing.

Steinar Haug, Nethelp consulting, sthaug at nethelp.no

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