From: Evgeniy Polyakov
> 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.
Hmmm, I don't think moving it around is worth the trouble
(nevertheless, I will test later if I find time).
For a full preemption kernel, both timer code and workqueue code
are executed in a thread of their own. If I know that there is a
500 us piece of code in either of them, I have to adjust the prio
of the corresponding thread (and all others) accordingly anyway.
For a non-full preemption kernel, your patch moves the 500 us
piece of code from kernel to thread context, so it really
improves things. But is 500 us something to worry about in a
non-full preemption kernel?
--
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]
