transfer: limit Windows SO_SNDBUF updates to once a second #10611
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- Change readwrite_upload() to call win_update_buffer_size() no more than once a second to update SO_SNDBUF (send buffer limit). Prior to this change during an upload readwrite_upload() could call win_update_buffer_size() anywhere from hundreds of times per second to an extreme test case of 100k per second (which is likely due to a bug, and that will be reported separately). In the latter case WPA profiler showed win_update_buffer_size was the highest capture count in readwrite_upload. In any case the calls were excessive and unnecessary. Closes #xxxx
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Could we move this into the cf-socket.c and keep the update time in its context? I think this would be a better place where the actual network writes happen. |
bagder
reviewed
Feb 27, 2023
| #if defined(WIN32) && defined(USE_WINSOCK) | ||
| struct curltime last_sndbuf_update; /* last time readwrite_upload called | ||
| win_update_buffer_size */ | ||
| #endif |
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Try putting entries in (roughly) size order in the struct to allow better packing optimization. Ie you could add this new struct above the two unsigned char entries.
It was in readwrite_upload so it's only used on sockets that are being used by libcurl to send (large) request uploads |
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Prior to this change during an upload readwrite_upload() could call win_update_buffer_size() anywhere from hundreds of times per second to an extreme test case of 100k per second (which is likely due to a bug, and that will be reported separately). In the latter case WPA profiler showed win_update_buffer_size was the highest capture count in readwrite_upload. In any case the calls were excessive and unnecessary.
Closes #xxxx