Date: Fri, 1 Aug 2003 10:33:59 -0700 (PDT) From: John Polstra <jdp@FreeBSD.org> To: src-committers@FreeBSD.org, cvs-src@FreeBSD.org, cvs-all@FreeBSD.org Subject: cvs commit: src/sys/dev/em if_em.c if_em.h if_em_osdep.h Message-ID: <200308011733.h71HXxAF002990@repoman.freebsd.org>
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jdp 2003/08/01 10:33:59 PDT
FreeBSD src repository
Modified files:
sys/dev/em if_em.c if_em.h if_em_osdep.h
Log:
Add facilities for tuning the "em" driver's interrupt delays without
recompiling the driver. See the comments near the top of "if_em.h"
for descriptions of these delays. Four new loader tunables control
the system-wide default values:
hw.em.tx_int_delay
hw.em.rx_int_delay
hw.em.tx_abs_int_delay
hw.em.rx_abs_int_delay
The tunables are specified in microseconds. The valid range is
0-67108 usec., and 0 means that the timer is disabled.
There are also four new sysctls (actually, a set of four for each
"em" device in the system) to query and change the interrupt delays
after the system is up:
hw.em0.tx_int_delay
hw.em0.rx_int_delay
hw.em0.tx_abs_int_delay (not present for 82542/3/4 adapters)
hw.em0.rx_abs_int_delay (not present for 82542/3/4 adapters)
It seems to be OK to change these values even while the adapter is
passing traffic.
Approved by: Prafulla Deuskar <pdeuskar@FreeBSD.ORG>
MFC after: 4 weeks
Revision Changes Path
1.28 +108 -9 src/sys/dev/em/if_em.c
1.19 +11 -4 src/sys/dev/em/if_em.h
1.12 +28 -30 src/sys/dev/em/if_em_osdep.h
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