Re: NS83820 2.6.0-test5 driver seems unstable on IA64

Ian Wienand
2003-09-23T23:04:22Z

On Tue, Sep 23, 2003 at 10:27:35AM -0700, David S. Miller wrote:
> As I understand it, you even do this stupid printk for user apps
> as well, that makes it more than rediculious.

Just as a point of interest, as an application programmer I think it's
the type of thing you want to know about quite loudly. The only
benchmark style figure on this I've ever seen is in this paper

http://msdn.microsoft.com/library/default.asp?url=/library/en-us/dv_vstechart/html/vcconWindowsDataAlignmentOnIPFX86X86-64.asp

(forgive the long url) which, if you scroll down to the little graph,
shows OS fixup is about 450 times slower that an aligned access. That
sucks, and if I didn't realise I'd done it, it would suck even more.

Oh, and I think fixing it up automatically & warning is much more
useful than sending a (by default) terminating signal to the program;
though I'm sure others might disagree.

-i
ianw@gelato.unsw.edu.au