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We presented a detailed analysis of the effect of WAN delays on the performance of event-driven servers, and showed that linear scaling in the select() and ufalloc() implementations leads to excessive kernel CPU consumption.

We described scalable versions of select() and ufalloc(), and evaluated their impact on the performance of event-driven servers. We showed that these changes improve the performance of Web servers and proxies on realistic benchmarks, and on a live proxy, without harming performance on naive benchmarks.

Our results show the need for a new, scalable interface to replace select(). We are currently working to develop this.

Gaurav Banga
Mon Apr 27 13:10:55 CDT 1998