forked from M-Labs/artiq
feed91d8b2
This brings mean RPC time from ~45ms to ~2ms. The cause of the slowness without buffering is, primarily, that lwip is severely pessimized by small writes, whether with Nagle on or off. (In fact, disabling Nagle makes it function *better* on many small writes, which begs the question of what's the point of having Nagle there in the first place.) In practical terms, the slowness appears only when writing a 4-byte buffer (the synchronization segment); writing buffers of other sizes does not trigger the problem. This all is extremely confusing and the fix is partly palliative, but since it seems to work reliably and we're migrating off lwip I think it is unwise to spend any more time debugging this. |
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| .. | ||
| applets | ||
| browser | ||
| compiler | ||
| coredevice | ||
| dashboard | ||
| devices | ||
| examples | ||
| frontend | ||
| gateware | ||
| gui | ||
| language | ||
| master | ||
| protocols | ||
| runtime | ||
| runtime.rs | ||
| sim | ||
| test | ||
| wavesynth | ||
| __init__.py | ||
| _version.py | ||
| appdirs.py | ||
| experiment.py | ||
| monkey_patches.py | ||
| tools.py | ||