lkml.org 
[lkml]   [2007]   [Aug]   [6]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: Old -rt patches
John Sigler wrote:

> I wrote a Linux app where I need high-resolution timers. I went all the
> way and installed the -rt patch, which includes the -hrt patches, as far
> as I understand.
>
> Since I could not afford to change kernels with every new release, I
> decided to track the 2.6.20 branch (arbitrarily).
>
> At this point I'm using 2.6.20.7-rt8 (-rt8 was the last patch to the
> 2.6.20 branch). (I see 2.6.20 is already up to .15)
>
> I see a lot of patches going into the -rt patch, but development moved
> on to 2.6.21, then 2.6.22, and now 2.6.23, following mainline.
>
> I'm not a kernel hacker, so I don't claim to understand the patches, but
> the comments sound like a few bugs are fixed here and there. I can't
> tell whether these bugs also exist in previous kernels or only appeared
> in newer kernels. Even if I knew, I probably wouldn't have the expertise
> to back-port the patch.
>
> I'm seeing weird behavior in my app, when it has been running 2-4 days.
> The timers start to act out, and all hell breaks loose. Basically, I
> have no idea what's going on...
>
> My question is: is it possible that there is a bug in 2.6.20-rt8 that
> has been fixed in subsequent -rt patches (there's a 2.6.21.6-rt21 and a
> 2.6.22.1-rt9)? In other words, if I give 2.6.21.6-rt8 or 2.6.22.1-rt9 a
> spin, is it possible that my weird behavior disappears?
>
> I'm not saying that it's impossible for the bug to be in my app, but the
> app is small enough that I'm fairly confident there's no problem there.

Would anyone care to comment?

Perhaps I could also test a different strategy, such as xenomai?
http://www.xenomai.org/

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

\
 
 \ /
  Last update: 2007-08-06 10:59    [W:0.062 / U:0.288 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site