Date: Sun, 22 Nov 1998 09:40:33 -0800 (PST) From: Bruce Evans <bde@FreeBSD.ORG> To: cvs-committers@FreeBSD.ORG, cvs-all@FreeBSD.ORG Subject: cvs commit: src/sys/i386/isa cy.c Message-ID: <199811221740.JAA11362@freefall.freebsd.org>
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bde 1998/11/22 09:40:33 PST
Modified files:
sys/i386/isa cy.c
Log:
Reduce i/o overheads by not preserving the channel access register in
interrupt handlers. Instead, load and use it atomically as necessary.
This reduces mode switching overhead for "polled" mode interrupt handling
from 5 i/o's to 3 (per service type, per port) so that polled mode is only
slightly more inefficient than "interrupt" mode.
Revision Changes Path
1.73 +130 -113 src/sys/i386/isa/cy.c
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