On Thu, 2011-02-03 at 08:13 +0200, Michael S. Tsirkin wrote: > > Initial TCP_STREAM performance results I got for guest to local > host > > 4.2Gb/s for 1K message size, (vs. 2.5Gb/s) > > 6.2Gb/s for 2K message size, and (vs. 3.8Gb/s) > > 9.8Gb/s for 4K message size. (vs.5.xGb/s) > > What is the average packet size, # bytes per ack, and the # of > interrupts > per packet? It could be that just slowing down trahsmission > makes GSO work better.
There is no TX interrupts with dropping packet. GSO/TSO is the key for small message performance, w/o GSO/TSO, the performance is limited to about 2Gb/s no matter how big the message size it is. I think any work we try here will increase large packet size rate. BTW for dropping packet, TCP increased fast retrans, not slow start. I will collect tcpdump, netstart before and after data to compare packet size/rate w/o w/i the patch. Thanks Shirley -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
