Re: [Xen-devel] Using debug-key 'o: Dump IOMMU p2m table, locks up machine

[Sander Eikelenboom <linux@xxxxxxxxxxxxxx>]

Hello Jan,

Tuesday, September 4, 2012, 8:35:40 AM, you wrote:

>>>> On 02.09.12 at 09:42, Keir Fraser <keir.xen@xxxxxxxxx> wrote:
>> On 31/08/2012 22:45, "Sander Eikelenboom" <linux@xxxxxxxxxxxxxx> wrote:
>>> - When using serial console: I get a infinite stream of "gfn:  mfn: " lines,
>>> mean while on the normal console, S-ATA devices are starting to give errors.
>> 
>> In this case the handler must be running in tasklet context. Not sure why
>> SATA interrupts would be affected as hardirq and softirq work will still be
>> carried out during execution of the keyhandler (the handler voluntarily
>> preempts itself for softirq work).
>> 
>> Would need more investigation. :)

> Isn't that because tasklets (i.e. idle vCPU-s with tasklets active)
> get preferred in the schedulers? Some compensation might be
> needed for the penalized vCPU, at least if that one is pinned
> (not sure whether load balancing would be able to steal the
> head of the run queue from a remote CPU). Sander - are you
> by chance pinning Dom0 vCPU-s? And how many of them does
> your Dom0 have?


Yes i do, could perhaps be the pinning of CPU0 ?

serveerstertje:~# xl vcpu-list
Name                                ID  VCPU   CPU State   Time(s) CPU Affinity
Domain-0                             0     0    0   r--    7711.7  0
Domain-0                             0     1    2   -b-    4048.1  2-5
Domain-0                             0     2    3   -b-    1129.1  2-5
Domain-0                             0     3    4   r--    1229.9  2-5
Domain-0                             0     4    5   -b-     885.5  2-5
Domain-0                             0     5    5   -b-    1192.5  2-5
database                             1     0    2   -b-    1063.6  2-5
database                             1     1    2   -b-     496.2  2-5
mail                                 2     0    5   -b-      42.3  2-5
samba                                3     0    4   -b-     178.4  2-5
webproxy                             4     0    2   -b-      49.9  2-5
www                                  5     0    4   -b-     104.1  2-5
davical                              6     0    2   -b-     119.6  2-5
backup                               7     0    5   -b-    1052.8  2-5
git                                  8     0    4   -b-      55.8  2-5
zabbix                               9     0    4   -b-     426.0  2-5
gallery3                            10     0    4   -b-      47.6  2-5
media                               11     0    2   -b-      40.9  2-5
torrentflux                         12     0    4   -b-      56.0  2-5
vpn                                 13     0    2   -b-     170.8  2-5
security                            14     0    2   -b-    2246.0  1-5
security                            14     1    4   -b-    1778.4  1-5
security                            14     2    1   -b-    1659.7  1-5
security                            14     3    5   -b-    1841.3  1-5
security                            14     4    3   -b-     981.1  1-5
creabox_hvm                         15     0    5   -b-     196.5  2-5
creabox_hvm                         15     1    4   -b-     255.8  2-5
creaexp                             16     0    2   -b-     297.8  2-5

serveerstertje:~# xl sched-credit
libxl: error: libxl.c:596:cpupool_info: failed to get info for cpupool1
: No such file or directory
Cpupool Pool-0: tslice=30ms ratelimit=1000us
Name                                ID Weight  Cap
Domain-0                             0   1024    0
database                             1    256    0
mail                                 2    256    0
samba                                3    256    0
webproxy                             4    256    0
www                                  5    256    0
davical                              6    256    0
backup                               7    256    0
git                                  8    256    0
zabbix                               9    256    0
gallery3                            10    256    0
media                               11    256    0
torrentflux                         12    256    0
vpn                                 13    256    0
security                            14    768    0
creabox_hvm                         15    256    0
creaexp                             16    256    0


> Jan





-- 
Best regards,
 Sander                            mailto:linux@xxxxxxxxxxxxxx


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