On Sun, 2004-11-21 at 21:27 +0900, Shunsuke SHINOMIYA wrote: > Jeremie, thank you for your comment. > > I did simple benchmark at some settings. > > I used two boxes which are single Xeon 2.4GHz with on-boarded em. > I measured a TCP throughput by iperf. > > These results show that the throughput of TCP increased if Interrupt > Moderation is turned OFF. At least, adjusting these parameters affected > TCP performance. Other appropriate combination of parameter may exist.
I have found interrupt moderation to seriously kill gigE performance.
Another test you can make is to have the driver always defrag packets in
em_encap(). Something like
m_head = m_defrag(*m_headp, M_DONTWAIT);
if (m_head == NULL)
return ENOBUFS;
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