lkml.org 
[lkml]   [2000]   [Aug]   [4]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [patch] lowlatency patch for 2.4, lowlatency-2.4.0-test6-B5

> > > - I haven't tested fbdev - Pavel says it's bad.
> >
> > thats pretty unsolvable (just as the serial console latencies), the
> > console layer assumes atomicity.
>
> Yup. console can block _interrupts_ for 2 millisecs, which is much worse
> than scheduling delays (network Rx overruns).

I have been thinking on how to deal with this as well. In do_con_write it
breaks up the writes into CON_BUF_SIZE. During each loop we could test for
current->need_sched. Break the lock if needed and schedule() then reset
the console lock. To prevent lost messages we could even use the
con_task_queue.

Q: Why did they deprecate a.out support in linux?
A: Because a nasty coff is bad for your elf.

James Simmons [jsimmons@linux-fbdev.org] ____/|
fbdev/console/gfx developer \ o.O|
http://www.linux-fbdev.org =(_)=
http://linuxgfx.sourceforge.net U
http://linuxconsole.sourceforge.net


-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.rutgers.edu
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2005-03-22 13:58    [from the cache]
©2003-2011 Jasper Spaans