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

["You, Yongkang" <yongkang.you@xxxxxxxxx>]

Hi Anthony,

I rerun the program. The exception happens at 1023. The following is the screen 
output and the dmesg from /var/log/message:

====== screen output======
iteration 1020 : a=(0, 0, -1020) :
iteration 1021 : a=(0, 0, -1021) :
iteration 1022 : a=(0, 0, -1022) :
Floating point exception
[root@localhost FPSWA]#

======/var/log/messages=====
Feb  6 11:21:13 localhost double_test: iteration #1020
Feb  6 11:21:13 localhost double_test: iteration #1021
Feb  6 11:21:13 localhost double_test: iteration #1022
Feb  6 11:21:13 localhost double_test: iteration #1023
Feb  6 11:21:13 localhost kernel: trigger_fpswa(463): floating-point assist 
fault at ip 4000000000000d32, isr 0000020000001001
Feb  6 11:21:13 localhost kernel: handle_fpu_swa: fp_emulate() returned -1


The attachment is the program.
Best Regards,
Yongkang (Kangkang) 永康

>-----Original Message-----
>From: Xu, Anthony
>Sent: 2006年2月6日 10:14
>To: 'Magenheimer, Dan (HP Labs Fort Collins)'; You, Yongkang;
>xen-ia64-devel@xxxxxxxxxxxxxxxxxxx
>Subject: RE: [Xen-ia64-devel] 2 LTP math cases failed in xen0
>
>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
>>> >> > >>
>>> >> > >>
>>> >> >
>>> >>
>>>

Attachment: trigger_fpswa.c
Description: trigger_fpswa.c

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