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Currently we walk through the entire list of not-yet-written IPC buffers when building the gathered I/O list for `sendmsg`, to determine the total remaining length of the messages, even after reaching the OS's limit on how many `iovec`s it will accept in one call. This patch halts the iteration when we reach the `iovec` limit, because we don't need the exact length; it's sufficient to know whether the entire message was written, which is impossible in that case. This increases throughput on large messages by about 7x on macOS (from ~0.04 to ~0.3 GB/s) and 1.7x on Linux (from ~0.3 to ~0.5 GB/s), on my test machines. The effect is more significant on macOS because its smaller socket buffer size (8kB vs. ~200kB) means we spend more time setting up the syscall per unit data copied; see also the next patch. Differential Revision: https://phabricator.services.mozilla.com/D105851 |
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| chromium | ||
| contentproc | ||
| glue | ||
| gtest | ||
| ipdl | ||
| mscom | ||
| testshell | ||
| moz.build | ||
| pull-chromium.py | ||