Date: Mon, 15 Sep 2003 06:49:18 -0700 (PDT) From: Bruce Evans <bde@FreeBSD.org> To: src-committers@FreeBSD.org, cvs-src@FreeBSD.org, cvs-all@FreeBSD.org Subject: cvs commit: src/sys/dev/sio sio.c Message-ID: <200309151349.h8FDnIl4034501@repoman.freebsd.org>
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bde 2003/09/15 06:49:18 PDT
FreeBSD src repository
Modified files:
sys/dev/sio sio.c
Log:
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.
Revision Changes Path
1.405 +7 -2 src/sys/dev/sio/sio.c
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