On Mon, 2007-01-10 at 00:11 -0400, Bill Fink wrote: > Have you done performance comparisons for the case of using 9000-byte > jumbo frames?
I havent, but will try if any of the gige cards i have support it. As a side note: I have not seen any useful gains or losses as the packet size approaches even 1500B MTU. For example, post about 256B neither the batching nor the non-batching give much difference in either throughput or cpu use. Below 256B, theres a noticeable gain for batching. Note, in the cases of my tests all 4 CPUs are in full-throttle UDP and so the occupancy of both the qdisc queue(s) and ethernet ring is constantly high. For example at 512B, the app is 80% idle on all 4 CPUs and we are hitting in the range of wire speed. We are at 90% idle at 1024B. This is the case with or without batching. So my suspicion is that with that trend a 9000B packet will just follow the same pattern. cheers, jamal - To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html
