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433b0a1295
Prevent do_tcp_sendpages() from calling tcp_push() (at least) once per page. Instead, arrange for tcp_push() to be called (at least) once per data payload. This results in more MSS-sized packets and fewer packets overall (5-10% reduction in my tests with typical OSD request sizes). See commits2f53384424("tcp: allow splice() to build full TSO packets"),35f9c09fe9("tcp: tcp_sendpages() should call tcp_push() once") andae62ca7b03("tcp: fix MSG_SENDPAGE_NOTLAST logic") for details. Here is an example of a packet size histogram for 128K OSD requests (MSS = 1448, top 5): Before: SIZE COUNT 1448 777700 952 127915 1200 39238 1219 9806 21 5675 After: SIZE COUNT 1448 897280 21 6201 1019 2797 643 2739 376 2479 We could do slightly better by explicitly corking the socket but it's not clear it's worth it. Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
Linux kernel
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