On Mon, 20 Apr 2009, Benzi wrote:
> Flow control is disabled. okay good. > Can you explain please why *decreasing* (and not increasing) the tx ring > buffer will help avoiding tx_restart_queue? the memory allocation and number of cachelines/pages being accessed goes from 1 page (at 256 descriptors) to 2 pages (at 512 descriptors) and it seems that the more pages that are accessed by the transmit routine/hardware writeback, the slower things get. > Regarding InterruptThrottleRate, do you mean that setting it to higher > value may also prevent tx_restart_queue by faster tx ring cleanup? absolutely, having a higher interrupt rate (default is only 4000 ints/second for tx) can significantly increase the number of packets that can be processed per second depending on a lot of factors including packet size and system memory speed. Jesse ------------------------------------------------------------------------------ Stay on top of everything new and different, both inside and around Java (TM) technology - register by April 22, and save $200 on the JavaOne (SM) conference, June 2-5, 2009, San Francisco. 300 plus technical and hands-on sessions. Register today. Use priority code J9JMT32. http://p.sf.net/sfu/p _______________________________________________ E1000-devel mailing list E1000-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/e1000-devel
