Date: Fri, 14 Dec 2001 09:56:13 -0800 (PST) From: Luigi Rizzo <luigi@FreeBSD.org> To: cvs-committers@FreeBSD.org, cvs-all@FreeBSD.org Subject: cvs commit: src/sys/conf files.i386 options.i386 src/sys/i386/i386 trap.c src/sys/kern kern_clock.c kern_intr.c kern_poll.c src/sys/net if.h if_var.h netisr.h src/sys/dev/fxp if_fxp.c if_fxpvar.h src/sys/pci if_dc.c if_dcreg.h if_sis.c if_sisreg.h Message-ID: <200112141756.fBEHuDb19786@freefall.freebsd.org>
next in thread | raw e-mail | index | archive | help
luigi 2001/12/14 09:56:13 PST
Modified files:
sys/conf files.i386 options.i386
sys/i386/i386 trap.c
sys/kern kern_clock.c kern_intr.c
sys/net if.h if_var.h netisr.h
sys/dev/fxp if_fxp.c if_fxpvar.h
sys/pci if_dc.c if_dcreg.h if_sis.c if_sisreg.h
Added files:
sys/kern kern_poll.c
Log:
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
Revision Changes Path
1.385 +1 -0 src/sys/conf/files.i386
1.162 +5 -0 src/sys/conf/options.i386
1.123 +59 -2 src/sys/dev/fxp/if_fxp.c
1.20 +4 -0 src/sys/dev/fxp/if_fxpvar.h
1.209 +10 -0 src/sys/i386/i386/trap.c
1.132 +12 -0 src/sys/kern/kern_clock.c
1.65 +14 -0 src/sys/kern/kern_intr.c
1.1 +422 -0 src/sys/kern/kern_poll.c (new)
1.67 +9 -0 src/sys/net/if.h
1.43 +9 -0 src/sys/net/if_var.h
1.25 +2 -1 src/sys/net/netisr.h
1.64 +83 -0 src/sys/pci/if_dc.c
1.23 +7 -0 src/sys/pci/if_dcreg.h
1.43 +77 -1 src/sys/pci/if_sis.c
1.10 +3 -0 src/sys/pci/if_sisreg.h
To Unsubscribe: send mail to majordomo@FreeBSD.org
with "unsubscribe cvs-all" in the body of the message
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?200112141756.fBEHuDb19786>