unaligned trap errors on alpha

[profmakx.fmp at gmx.de]

Hi!

Thanks for your answer. I know about unaligned traps pretty well (as im 
used to program on alpha). But I havent got the time to pinpoint this 
trap and I dont know the samba source that good. The only thing that I 
can say regarding this is that It only happens (nearly only) during 
writing data. I dont know if it helps when I copy the address out of 
/var/log/messages. I now use the latest pre 3.0.0 (samba-tng 2.6.0 beta ) 
but I havent testet it yet. Before that I used 2.0.7 ..


Sep 14 15:26:26 fmpserver kernel: smbd(19751): unaligned trap at 
00000001200e61c
0: 00000001202c6244 27 10
Sep 14 15:26:26 fmpserver kernel: smbd(19751): unaligned trap at 
00000001200e61c
4: 00000001202c624c 27 11
Sep 14 15:39:14 fmpserver kernel: smbd(19827): unaligned trap at 
00000001200e61c
0: 00000001202c6244 27 10
Sep 14 15:39:14 fmpserver kernel: smbd(19827): unaligned trap at 
00000001200e61c


Additional info following if needed ...

> On Thu, 14 Sep 2000 profmakx.fmp at gmx.de wrote:

> > Hi all!1

> > This is my first post to this list so please dont nuke me :-)

> > Ive got a little problem with my alpha-smb-server under suse linux 6.4. I
> > downloaded the sources for samba to compile the newest version with
> > support for domain-logons ( for the win98 machines on my network ).
> > The read performance is O.K, but when it comes to writing performance
> > drops ( no it isnt there anymore ). Whenever this happens, I get
> > "unaligned trap errors". I know that it is a programming issue as alpha
> > as other RISC CPUs can only access aligned data ... If additional
> > information is needed I can provide it.

> This seems to be a frequent problem on Linux/Alpha, although I see fewer 
of
> these as time goes on.  If you're seeing a lot of unaligned traps, that 
will
> definitely cause a performance drop because every one of those traps
> represents an instruction that has to be cleaned up by the kernel before 
it
> can be handed to the processor -- definitely an expensive operation.

> Unaligned traps tend to be easy to fix, but hard to pinpoint.  I'm sure 
that
> any information you could provide to make it easier to pinpoint would be
> useful.

> BTW, what version of Samba does SuSE 6.4 ship with? It's also possible 
that
> this problem has already been fixed, and that you can improve performance 
just
> by upgrading to Samba 2.0.7.

> Steve Langasek
> postmodern programmer
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