nanog mailing list archives
RE: GSR, 7600, Juniper M?, oh my!
From: "David Schwartz" <davids () webmaster com>
Date: Tue, 13 Jan 2004 03:00:17 -0800
On Tue, Jan 13, 2004 at 02:01:48AM +0100, Jesper Skriver wrote:
That would depend what is causing the CPU usage. If it is software based IP header lookups, you're not going to get any more peformance out of it by trying to do more lookups than your CPU can handle.
Surprisingly, that's usually not true. The cost of the IP header lookup is generally much less than the cost of a task switch. So when the system is at 100%, it's probably doing this: IP header lookup, wait for work / task switch, IP header lookup, wait for work / task switch, repeat As the load increases, it will start doing two IP header lookups before each task switch or yield. Then three. Then four. DS
Current thread:
- RE: GSR, 7600, Juniper M?, oh my!, (continued)
- RE: GSR, 7600, Juniper M?, oh my! Drew Weaver (Jan 07)
- RE: GSR, 7600, Juniper M?, oh my! Alex Rubenstein (Jan 07)
- RE: GSR, 7600, Juniper M?, oh my! Michel Py (Jan 07)
- RE: GSR, 7600, Juniper M?, oh my! jlewis (Jan 07)
- RE: GSR, 7600, Juniper M?, oh my! Jason Frisvold (Jan 07)
- Re: GSR, 7600, Juniper M?, oh my! Tarko Tikan (Jan 07)
- RE: GSR, 7600, Juniper M?, oh my! Christopher J. Wolff (Jan 07)
- Re: GSR, 7600, Juniper M?, oh my! Tarko Tikan (Jan 07)
- Re: GSR, 7600, Juniper M?, oh my! Jesper Skriver (Jan 12)
- Re: GSR, 7600, Juniper M?, oh my! Richard A Steenbergen (Jan 12)
- RE: GSR, 7600, Juniper M?, oh my! David Schwartz (Jan 13)
- Re: GSR, 7600, Juniper M?, oh my! Tarko Tikan (Jan 07)
- RE: GSR, 7600, Juniper M?, oh my! Drew Weaver (Jan 07)
- Re: GSR, 7600, Juniper M?, oh my! JC Dill (Jan 08)