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drivers/usbdev/cdcncm: send TX immediately instead of after a tick-quantized delay #19469

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Merged
jerpelea merged 1 commit into from
Jul 28, 2026
+7 −2
Merged

drivers/usbdev/cdcncm: send TX immediately instead of after a tick-quantized delay #19469

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9 changes: 7 additions & 2 deletions drivers/usbdev/cdcncm.c
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Original file line number Diff line number Diff line change
Expand Up @@ -1302,8 +1302,13 @@ static int cdcncm_send(FAR struct netdev_lowerhalf_s *dev, FAR netpkt_t *pkt)
}
else
{
work_queue(ETHWORK, &self->delaywork, cdcncm_transmit_work, self,
MSEC2TICK(CDCNCM_DGRAM_COMBINE_PERIOD));
/* Defer to the work thread with zero delay. A non-zero delay is
* rounded up to a full tick (10ms at 100Hz), which dominated the
* USB-NIC round-trip; delay 0 wakes the worker immediately while
* still coalescing datagrams appended in the same TX burst.
*/

work_queue(ETHWORK, &self->delaywork, cdcncm_transmit_work, self, 0);
}

return OK;
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