Hello, Google is running Cygwin apps on its 10Gb networks and we are seeing extremely bad performance in a couple of cases. For example, iperf with the defaults results in only 10Mbits/sec. We tracked this down to a combination of non-blocking sockets with Nagle+delayed ack kicking in, since the apps eventually end up sending a very small packets (2 bytes). We have a case open against Microsoft but since everything is moving very slow we would like to work around by picking socket buffers that are multiple of 4k.
Change log: 2014-11-18 Iuliu Rus <[email protected]> * net.cc Change default values for socket buffers to fix performance on 10Gb networks.
net_patch
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