Kangkang,
Can you post the values of fraction and exponent when iteration equal to 1020,
1021, 1023, 1024 in case there are other floating point issues?
Thanks,
-Anthony
>-----Original Message-----
>From: xen-ia64-devel-bounces@xxxxxxxxxxxxxxxxxxx
>[mailto:xen-ia64-devel-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of Magenheimer,
>Dan (HP Labs Fort Collins)
>Sent: 2006年1月27日 1:23
>To: You, Yongkang; xen-ia64-devel@xxxxxxxxxxxxxxxxxxx
>Subject: RE: [Xen-ia64-devel] 2 LTP math cases failed in xen0
>
>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) 永康
>>
>> >-----Original Message-----
>> >From: Magenheimer, Dan (HP Labs Fort Collins)
>> >[mailto:dan.magenheimer@xxxxxx]
>> >Sent: 2006年1月26日 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) 永康
>> >> >
>> >> > >-----Original Message-----
>> >> > >From: Magenheimer, Dan (HP Labs Fort Collins)
>> >> > >[mailto:dan.magenheimer@xxxxxx]
>> >> > >Sent: 2006年1月21日 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) 永康
>> >> > >>
>> >> > >>
>> >> >
>> >>
>>
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