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Re: pae MP on cherry-xenmp

On Tue, 30 Aug 2011, Jeff Rizzo wrote:

I did fairly quickly have the same panic Michael did (note that this is in a kernel including the per-cpu MMU queue commit you made about 45m ago).:

With my last version of my patch, I was able to run with 4 vcpus for a while. I was having some things going on - most noticable was a number of my cacti graphs weren't being drawn correctly, if at all. I then updated with Cherry's last commit and started with 4 vcpus again. My cacti graphs looked much better at that point, but I got this same panic fairly quickly.

panic: kernel diagnostic assertion "gnt_entries[last_gnt_entry] == XENGNT_NO_ENTRY" failed: file "/Users/riz/Documents/code/netbsd/xenmpsrc/sys/arch/xen/xen/xengnt.c", line 208

I just took a quick look at this code, and it looks like it's a problem of MP-unsafe code. It's using splvm() to protect sections of code, which isn't going to work for MP. I'm going to see if I can add a mutex and see if that works better.

fatal breakpoint trap in supervisor mode
trap type 1 code 0 eip c0136934 cs 9 eflags 246 cr2 caff6000 ilevel 6
Stopped in pid 75.1 (ssh) at    netbsd:breakpoint+0x4:  popl    %ebp
at netbsd:breakpoint+0x4
,c04ba63c) at netbsd:panic+0x20c
0) at netbsd:kern_assert+0x39
xengnt_get_entry(0,cb41a2c0,0,1e6f323e,4,30e,cb87fc5c,c01c0934,0,974e9000) at ne
xengnt_grant_access(0,974e9000,1,4,cb0a325c,0,1e5f3,0,0,0) at netbsd:xengnt_gran
xennet_softstart(cb0a2004,0,4,5,cb87fd00,0,cb87fc98,ca73a074,ca73a154,ca705440) a
t netbsd:xennet_softstart+0x514
softint_overlay(5,cb095040,bb230000,30,cb095040,1,cb87fd28,cb41a2c0,cb41b87c,0) a
t netbsd:softint_overlay+0x483
0) at netbsd:lwp_userret+0x215
syscall(cb87fd48,bb4000b3,1f,bf7f001f,bb60001f,bb230000,30,bf7fbf68,bb63b398,0) a
t netbsd:syscall+0x15f
ds          cb0a0011
es          c04b0011    copyright+0x383d1
fs          31
gs          cb870011
edi         cb0a325c
esi         c04bd818    copyright+0x45bd8
ebp         cb87fb3c
ebx         104
edx         0
ecx         c04bd818    copyright+0x45bd8
eax         1
eip         c0136934    breakpoint+0x4
cs          9
eflags      246
esp         cb87fb3c
ss          11
netbsd:breakpoint+0x4:  popl    %ebp


Michael L. Hitch                        mhitch%montana.edu@localhost
Computer Consultant
Information Technology Center
Montana State University        Bozeman, MT     USA

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