On 2015-07-02 23:56:16 +0300, Heikki Linnakangas wrote: > On 04/10/2015 01:46 PM, chenhj wrote: > >Result(execute time): > >default(8K), 7.370s > >set SO_SNDBUF to 32K, 4.159s(the current implement) > >set SO_SNDBUF to 64K, 2.875s > >set SO_SNDBUF to 128K, 1.593s > >set SO_SNDBUF to 256K, 1.324s > > I was about to commit the attached, but when I tested this between my > Windows 8.1 virtual machine and Linux host, I was not able to see any > performance difference. It may be because the case is hobbled by other > inefficiencies, in the virtualization or somewhere else, but I wonder if > others can reproduce the speedup?
Given that too small sockets incur significantly smaller latency bumps in a virtualized environment than in a real network, and hit another set of buffers inside the virtualization technology,, I'm not particularly surprised by that. Greetings, Andres Freund -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers
