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515d4440fe
freebsd-dev/sys
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John Polstra 515d4440fe 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
2003-08-01 17:33:59 +00:00
..
alpha In set_mcontext(), store the (user) stack pointer and the thread 2003-07-31 05:27:00 +00:00
amd64 Make sure that when the PV ENTRY zone is created in pmap, that it's 2003-07-31 03:39:51 +00:00
arm sys/sys/limits.h: 2003-05-19 20:29:07 +00:00
boot Fix the ski loader, broken by the gcc upgrade. Update the linker 2003-07-17 01:49:59 +00:00
cam Fix the new DA_OLD_QUIRKS option for normal and module compiles. 2003-07-29 18:08:16 +00:00
coda Add a "int fd" argument to VOP_OPEN() which in the future will 2003-07-26 07:32:23 +00:00
compat Try to make 'uname -a' look more like it does on Linux: 2003-07-29 10:03:15 +00:00
conf Fix ordering bug created by previous commit. While here, make ppc(4) 2003-08-01 05:28:43 +00:00
contrib Make this compile on 64 bit systems again. You cannot just cast a 32 bit 2003-07-28 10:25:26 +00:00
crypto Use __FBSDID(). 2003-06-10 21:44:29 +00:00
ddb Update the 'ps', 'show pci', and 'show ktr' ddb commands to use the new 2003-07-31 17:29:42 +00:00
dev Add facilities for tuning the "em" driver's interrupt delays without 2003-08-01 17:33:59 +00:00
fs Add a "int fd" argument to VOP_OPEN() which in the future will 2003-07-26 07:32:23 +00:00
geom Fix a memory leak in CCD's mirror code. 2003-07-29 20:04:06 +00:00
gnu Add a "int fd" argument to VOP_OPEN() which in the future will 2003-07-26 07:32:23 +00:00
i4b Undo agressive inlining which GCC previously wisely ignored. 2003-07-23 17:58:41 +00:00
i386 Have a go at unbreaking the tinderbox by fixing a debug printf. 2003-07-31 08:20:24 +00:00
ia64 Write the preserved registers to (and read them from) struct reg and 2003-08-01 07:21:34 +00:00
isa Add printer support to puc(4) driver. 2003-08-01 02:25:32 +00:00
isofs/cd9660 Add a "int fd" argument to VOP_OPEN() which in the future will 2003-07-26 07:32:23 +00:00
kern Fix kernel build -- 'c' was the unused var, not 'lines'. 2003-08-01 17:00:49 +00:00
libkern Backed out the micro-optimization in 1.4. It was to help gcc-2.6.3 2003-07-25 15:54:23 +00:00
modules Fix the new DA_OLD_QUIRKS option for normal and module compiles. 2003-07-29 18:08:16 +00:00
net Implement a mechanism by which ATM drivers can inform interested 2003-07-29 13:04:52 +00:00
net80211 add monitor mode 2003-07-21 02:49:42 +00:00
netatalk - Use if_broadcastaddr from struct ifnet rather than relying on 2003-03-21 17:53:16 +00:00
netatm The number of prefixes can never be negative so use an u_int for this. 2003-07-29 13:46:43 +00:00
netgraph Process events from the ATM drivers. Carrier change and PVC change 2003-07-29 16:27:23 +00:00
netinet o Fix a typo in previous commit. 2003-07-31 10:24:36 +00:00
netinet6 Cleanup useless break. 2003-07-29 14:10:13 +00:00
netipsec consolidate callback optimization check in one location by adding a flag 2003-06-30 05:09:32 +00:00
netipx Use __FBSDID(). 2003-06-11 05:37:42 +00:00
netkey Use __FBSDID(). 2003-06-11 05:37:42 +00:00
netnatm Instead of returning an error call the ioctl() handler of the interface 2003-07-15 15:51:50 +00:00
netncp size_t != int. Make this compile on 64 bit platforms (eg: amd64). 2003-07-24 01:59:18 +00:00
netsmb Reserve space for the trailing null byte in the srvname member of 2003-07-27 11:36:00 +00:00
nfs
nfsclient Fix a problem that occurs when truncating files on NFSv3 mounts: we need 2003-07-29 00:17:29 +00:00
nfsserver Change idle state sleep identifier to "-" for nfsd. 2003-07-02 08:08:32 +00:00
opencrypto consolidate callback optimization check in one location by adding a flag 2003-06-30 05:09:32 +00:00
pc98 Cosmetic: fix disorder of opt_kstack_pages.h include. 2003-07-31 01:26:40 +00:00
pccard Add comment point o2micro people to NEWCARD 2003-08-01 16:10:48 +00:00
pci Use the BUS_DMA_ZERO flag. 2003-07-27 14:38:54 +00:00
posix4 Use __FBSDID(). 2003-06-11 06:34:30 +00:00
powerpc Make sure that when the PV ENTRY zone is created in pmap, that it's 2003-07-31 03:39:51 +00:00
rpc
security Attempt to simplify #ifdef logic for MAC_ALWAYS_LABEL_MBUF. 2003-08-01 15:45:14 +00:00
sparc64 Deal with 'options KSTACK_PAGES' being a global option. 2003-07-31 01:31:32 +00:00
sys Add a new function to look for a spinlock's instance when it is held by 2003-07-31 18:50:58 +00:00
tools Don't check the state of the vnode interlock if the specification says 2003-06-22 21:20:06 +00:00
ufs Rename VOP_RMEXTATTR() to VOP_DELETEEXTATTR() for consistency with the 2003-07-28 18:53:29 +00:00
vm Remove unused stuff. 2003-07-31 22:19:28 +00:00
Makefile Revert exclusion for amd64 that stopped boot/ being built. 2003-06-26 03:52:48 +00:00