nanog mailing list archives
Re: high performance open source DHCP solution?
From: Florian Weimer <fweimer () bfk de>
Date: Mon, 25 Jul 2011 10:59:44 +0000
* Jimmy Hess:
On Wed, Jul 20, 2011 at 9:31 AM, Nick Colton <ncolton () allophone net> wrote:We were seeing similar issues with low leases, moved the dhcpd.leases file to a ramdisk and went from ~200 leases per second to something like 8,000 leases per second.Yes, blame RFC2131's requirement that a DHCP server is to ensure that any lease is committed to persistent storage, strictly before a DHCP server is allowed to send the response to the request; a fully compliant DHCP server with sufficient traffic is bound by the disk I/O rate of underlying storage backing its database.
Come on, group commits are not that difficult to implement. With them, you should be able to obtain 8 kHZ leases on a single spindle (assuming the per-client data is just a few hundred bytes), without violating the RFC requirement. -- Florian Weimer <fweimer () bfk de> BFK edv-consulting GmbH http://www.bfk.de/ Kriegsstraße 100 tel: +49-721-96201-1 D-76133 Karlsruhe fax: +49-721-96201-99 _____ NANOG mailing list NANOG () nanog org https://mailman.nanog.org/mailman/listinfo/nanog
Current thread:
- Re: high performance open source DHCP solution?, (continued)
- Re: high performance open source DHCP solution? PC (Jul 21)
- Re: high performance open source DHCP solution? Florian Weimer (Jul 25)
- Re: high performance open source DHCP solution? Charles Morris (Jul 21)
- Re: high performance open source DHCP solution? Nick Colton (Jul 21)
- Re: high performance open source DHCP solution? Jay Ashworth (Jul 20)
- Re: high performance open source DHCP solution? Mark Andrews (Jul 20)
- Re: high performance open source DHCP solution? Owen DeLong (Jul 20)
- Re: high performance open source DHCP solution? Joel Jaeggli (Jul 20)
- Re: high performance open source DHCP solution? Miquel van Smoorenburg (Jul 22)
- Re: high performance open source DHCP solution? Leo Bicknell (Jul 22)
- Re: high performance open source DHCP solution? Florian Weimer (Jul 25)