North American Network Operators Group Date Prev | Date Next | Date Index | Thread Index | Author Index | Historical RE: GSR, 7600, Juniper M?, oh my!
> 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
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