Re: [patch] lowlatency patch for 2.4, lowlatency-2.4.0-test6-B5

[James S. <jsi...@ac...>]

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