Date: Sat, 5 Jan 2002 20:58:09 -0800 (PST) From: Matt Dillon <dillon@FreeBSD.org> To: cvs-committers@FreeBSD.org, cvs-all@FreeBSD.org Subject: cvs commit: src/sys/isa sio.c Message-ID: <200201060458.g064w9626629@freefall.freebsd.org>
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dillon 2002/01/05 20:58:09 PST
Modified files: (Branch: RELENG_4)
sys/isa sio.c
Log:
MFC 1.354 - lower FIFO threshold to MEDH to increase the amount of interrupt
slop we can survive from 174uS to 694uS (@115200 bps). This appears to
solve silo overflow errors for a number of people. Such errors can occur
due to video cards hogging memory bandwidth as well as inefficiencies in
the kernel (interrupts left disabled for too long a period of time).
Modern cpu's can easily handle the increased serial interrupt rate
(1440 hz instead of 822 hz @ 115200 bps).
Approved by: re, bde, imp
Revision Changes Path
1.291.2.25 +8 -1 src/sys/isa/sio.c
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