From: Evgeniy Polyakov [mailto:[email protected]]
> Each MDIO read can take upto 2 msecs (!) and at least 20
> usecs in e100,
> and this runs in timer handler.
> Concider attaching (only compile tested) patch which moves
> e100 watchdog
> into workqueue.
Tested the patch. Works and has the expected effects:
Fully preemptible kernel:
No change: 500 us delay at rtprio 1, no delay at higher rtprio.
(you just moved the 500 us piece of code from one rtprio 1 kernel
thread to another rtprio 1 kernel thread).
Kernel with desktop preemption:
Originally: Threads at any rtprio suffered from 500 us delay.
With your patch: Only rtprio 1 threads suffer from 500 us delay,
no delay at higher rtprio.
--
Klaus Kusche (Software Development - Control Systems)
KEBA AG Gewerbepark Urfahr, A-4041 Linz, Austria (Europe)
Tel: +43 / 732 / 7090-3120 Fax: +43 / 732 / 7090-6301
E-Mail: [email protected] WWW: www.keba.com
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to [email protected]
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
[Index of Archives]
[Kernel Newbies]
[Netfilter]
[Bugtraq]
[Photo]
[Stuff]
[Gimp]
[Yosemite News]
[MIPS Linux]
[ARM Linux]
[Linux Security]
[Linux RAID]
[Video 4 Linux]
[Linux for the blind]
[Linux Resources]
