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author | luigi <luigi@FreeBSD.org> | 2001-12-14 17:56:12 +0000 |
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committer | luigi <luigi@FreeBSD.org> | 2001-12-14 17:56:12 +0000 |
commit | f8ad22919e217e5aa0f3f7a246fc37aaee182364 (patch) | |
tree | 4ea0e407bb3cf5815d6067507d1fdc39f76f58e6 /sys/net/netisr.h | |
parent | 34c1073cfc26bcfb3b31de63c71ab21bcd44065e (diff) | |
download | FreeBSD-src-f8ad22919e217e5aa0f3f7a246fc37aaee182364.zip FreeBSD-src-f8ad22919e217e5aa0f3f7a246fc37aaee182364.tar.gz |
Device Polling code for -current.
Non-SMP, i386-only, no polling in the idle loop at the moment.
To use this code you must compile a kernel with
options DEVICE_POLLING
and at runtime enable polling with
sysctl kern.polling.enable=1
The percentage of CPU reserved to userland can be set with
sysctl kern.polling.user_frac=NN (default is 50)
while the remainder is used by polling device drivers and netisr's.
These are the only two variables that you should need to touch. There
are a few more parameters in kern.polling but the default values
are adequate for all purposes. See the code in kern_poll.c for
more details on them.
Polling in the idle loop will be implemented shortly by introducing
a kernel thread which does the job. Until then, the amount of CPU
dedicated to polling will never exceed (100-user_frac).
The equivalent (actually, better) code for -stable is at
http://info.iet.unipi.it/~luigi/polling/
and also supports polling in the idle loop.
NOTE to Alpha developers:
There is really nothing in this code that is i386-specific.
If you move the 2 lines supporting the new option from
sys/conf/{files,options}.i386 to sys/conf/{files,options} I am
pretty sure that this should work on the Alpha as well, just that
I do not have a suitable test box to try it. If someone feels like
trying it, I would appreciate it.
NOTE to other developers:
sure some things could be done better, and as always I am open to
constructive criticism, which a few of you have already given and
I greatly appreciated.
However, before proposing radical architectural changes, please
take some time to possibly try out this code, or at the very least
read the comments in kern_poll.c, especially re. the reason why I
am using a soft netisr and cannot (I believe) replace it with a
simple timeout.
Quick description of files touched by this commit:
sys/conf/files.i386
new file kern/kern_poll.c
sys/conf/options.i386
new option
sys/i386/i386/trap.c
poll in trap (disabled by default)
sys/kern/kern_clock.c
initialization and hardclock hooks.
sys/kern/kern_intr.c
minor swi_net changes
sys/kern/kern_poll.c
the bulk of the code.
sys/net/if.h
new flag
sys/net/if_var.h
declaration for functions used in device drivers.
sys/net/netisr.h
NETISR_POLL
sys/dev/fxp/if_fxp.c
sys/dev/fxp/if_fxpvar.h
sys/pci/if_dc.c
sys/pci/if_dcreg.h
sys/pci/if_sis.c
sys/pci/if_sisreg.h
device driver modifications
Diffstat (limited to 'sys/net/netisr.h')
-rw-r--r-- | sys/net/netisr.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/sys/net/netisr.h b/sys/net/netisr.h index 621cf22..35e8cc1 100644 --- a/sys/net/netisr.h +++ b/sys/net/netisr.h @@ -52,6 +52,7 @@ * interrupt used for scheduling the network code to calls * on the lowest level routine of each protocol. */ +#define NETISR_POLL 0 /* polling callback, must be first */ #define NETISR_IP 2 /* same as AF_INET */ #define NETISR_NS 6 /* same as AF_NS */ #define NETISR_ATALK 16 /* same as AF_APPLETALK */ |