RE: [Xen-ia64-devel] 2 LTP math cases failed in xen0

["Magenheimer, Dan (HP Labs Fort Collins)" <dan.magenheimer@xxxxxx>]

Thanks Yongkang.

So those tests definitely require FPSWA and FPSWA is
not (yet) implemented for Xen/ia64 (non-VTI) for either
dom0 or domU... search for "fpswa" in xen/arch/ia64/xen/dom_fw.c

> Native will get FPSWA fault as the doc said when iteration 
> equals to 1024. But Xen0 will get FPSWA fault and Floating 
> point exception, when iteration only equals to 1022.

Interesting.  This may be another bug, but let's try
again after fpswa is implemented.

Dan

> -----Original Message-----
> From: You, Yongkang [mailto:yongkang.you@xxxxxxxxx] 
> Sent: Thursday, January 26, 2006 1:17 AM
> To: Magenheimer, Dan (HP Labs Fort Collins); 
> xen-ia64-devel@xxxxxxxxxxxxxxxxxxx
> Subject: RE: [Xen-ia64-devel] 2 LTP math cases failed in xen0
> 
> Hi Dan, 
> 
> I have read the doc your provided. Before I try it, I can 
> catch "floating-point assist fault" in /var/log/messages both 
> IA64 Native and Xen0.
> 
> Then I do the test: use compile flag -ffast-math to rebuild 
> float cases, there are no FPSWA fault in the dmesg, while the 
> case can still pass in the Native Linux. So ... I am not sure 
> if am I right.
> 
> I also try the program provided in the doc. But I get 
> interesting different results between Native and Xen0.
> 
> Native will get FPSWA fault as the doc said when iteration 
> equals to 1024. But Xen0 will get FPSWA fault and Floating 
> point exception, when iteration only equals to 1022.
> 
> Best Regards,
> Yongkang (Kangkang) æå
> 
> >-----Original Message-----
> >From: Magenheimer, Dan (HP Labs Fort Collins)
> >[mailto:dan.magenheimer@xxxxxx]
> >Sent: 2006å1æ26æ 8:11
> >To: You, Yongkang; xen-ia64-devel@xxxxxxxxxxxxxxxxxxx
> >Subject: RE: [Xen-ia64-devel] 2 LTP math cases failed in xen0
> >
> >An easier way to check is described here:
> >
> >http://i-cluster2.inrialpes.fr/doc/misc/fpswa.txt
> >
> >> -----Original Message-----
> >> From: Magenheimer, Dan (HP Labs Fort Collins)
> >> Sent: Wednesday, January 25, 2006 3:23 PM
> >> To: 'You, Yongkang'; xen-ia64-devel@xxxxxxxxxxxxxxxxxxx
> >> Subject: RE: [Xen-ia64-devel] 2 LTP math cases failed in xen0
> >>
> >> There may be better ways of turning off FPSWA, but
> >> here's one that should work:
> >>
> >> Change linux/arch/ia64/kernel/traps.c:trap_init() so
> >> that fpswa_interface is always set to 0.
> >>
> >> If a native kernel without this change passes the
> >> two LTP float_* tests but the same native kernel with
> >> this change fails, it would explain why Xen/ia64 doesn't
> >> work on the tests... Xen/ia64 doesn't support FPSWA.
> >>
> >> > -----Original Message-----
> >> > From: You, Yongkang [mailto:yongkang.you@xxxxxxxxx]
> >> > Sent: Sunday, January 22, 2006 6:54 PM
> >> > To: Magenheimer, Dan (HP Labs Fort Collins);
> >> > xen-ia64-devel@xxxxxxxxxxxxxxxxxxx
> >> > Subject: RE: [Xen-ia64-devel] 2 LTP math cases failed in xen0
> >> >
> >> > Hi Dan,
> >> >
> >> > I am not sure about how to check if those math cases are
> >> > using FPSWA. I greped the key word in float math cases, but
> >> > nothing found.
> >> >
> >> > 1 information is that these 2 cases (float_exp_log and
> >> > float_power) can pass in the VTi and IA32 testing. I paste
> >> > the float codes in the attachment tar ball. Hope it can give
> >> > some help. If need any information, please let me know.
> >> >
> >> > Best Regards,
> >> > Yongkang (Kangkang) æå
> >> >
> >> > >-----Original Message-----
> >> > >From: Magenheimer, Dan (HP Labs Fort Collins)
> >> > >[mailto:dan.magenheimer@xxxxxx]
> >> > >Sent: 2006å1æ21æ 1:23
> >> > >To: You, Yongkang; xen-ia64-devel@xxxxxxxxxxxxxxxxxxx
> >> > >Subject: RE: [Xen-ia64-devel] 2 LTP math cases failed in xen0
> >> > >
> >> > >Hi Yongkang --
> >> > >
> >> > >Could you see if the math tests that fail are using
> >> > >FPSWA (the EFI floating point software assist module)?
> >> > >I think it is possible to boot Linux with FPSWA disabled.
> >> > >If this also fails these math tests, it would explain
> >> > >why Xen/ia64 fails these tests as Xen/ia64 does not
> >> > >currently support FPSWA (or any EFI modules).
> >> > >
> >> > >Thanks,
> >> > >Dan
> >> > >
> >> > >> -----Original Message-----
> >> > >> From: xen-ia64-devel-bounces@xxxxxxxxxxxxxxxxxxx
> >> > >> [mailto:xen-ia64-devel-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf
> >> > >> Of You, Yongkang
> >> > >> Sent: Friday, January 20, 2006 12:35 AM
> >> > >> To: xen-ia64-devel@xxxxxxxxxxxxxxxxxxx
> >> > >> Subject: [Xen-ia64-devel] 2 LTP math cases failed in xen0
> >> > >>
> >> > >> Hi all,
> >> > >>
> >> > >> I have run a basic LTP testing on Xen0. Except for 1 system
> >> > >> call case failed has reported, there are 2 math cases failed
> >> > >> too. But they can pass in the Native Linux of the same
> >> > >> hardware environment. These two cases are related to float
> >> > >> calculation.
> >> > >>
> >> > >> The testing environment is:
> >> > >> Xen source is xen-ia64-unstable tree Changeset 8476.
> >> > >> CPU is Intel Montecito.
> >> > >> Native and service OS Linux is RHEL4u2.
> >> > >> The LTP is the one of 2005-12-5.
> >> > >>
> >> > >> The attachment is the summary of testing results. This time I
> >> > >> run these test suites:
> >> > >> systemcall, memory test, disk io, nptl, math, ipc, pty,
> >> sched, fs.
> >> > >>
> >> > >> I will try to run more testing of LTP and report issues. Hope
> >> > >> it can help to stable xen0. :)
> >> > >>
> >> > >> Best Regards,
> >> > >> Yongkang (Kangkang) æå
> >> > >>
> >> > >>
> >> >
> >>
> 

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