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| /freebsd-11-stable/sys/dev/sio/ | ||
| H A D | sio.c | diff 120091 Mon Sep 15 11:49:18 MDT 2003 bde Quick fix for a pessimization in rev.1.194. An extra i/o instruction was added to the fast path to support the COM_IIR_RXRDYBUG() case even when that case is not configured. This increased the relative overhead of sio input by almost 25% in the worst case and by 2-3% in the usual case (usually only about 0.2% absolute per port at 115200 bps). The quick fix is to significantly pessimize only the COM_IIR_RXRDYBUG() case. |
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