RE: [Xen-devel] unnecessary VCPU migration happens again

["Xu, Anthony" <anthony.xu@xxxxxxxxx>]

Emmanuel Ackaouy write on 2006年12月19日 17:00:
> On Dec 19, 2006, at 8:02, Xu, Anthony wrote:
> Can you dump the credit scheduler stat counter before and after you
> run the
> benchmark? (^A^A^A on the dom0/hypervisor console to switch to the
> hypervisor
> and then type the "r" key to dump scheduler info). That along with an
> idea of the
> elapsed time between the two stat samples would be handy.

Hi Emmanuel,

I got the dump scheduler info.

The evironment is,
Two sockects, two cores per sockect.
Dom0 is UP,
DomVTI is 2 VCPU SMP,
There are 4 physical CPUs,
There are 3 VCPUs totally.

We run Kernel Build on VTI domain.
>make -j3

Before running KB

(XEN) *** Serial input -> DOM0 (type 'CTRL-a' three times to switch input to 
Xen).
(XEN) *** Serial input -> Xen (type 'CTRL-a' three times to switch input to 
DOM0).
(XEN) Scheduler: SMP Credit Scheduler (credit)
(XEN) info:
(XEN)   ncpus              = 4
(XEN)   master             = 0
(XEN)   credit             = 1200
(XEN)   credit balance     = 0
(XEN)   weight             = 0
(XEN)   runq_sort          = 12233
(XEN)   default-weight     = 256
(XEN)   msecs per tick     = 10ms
(XEN)   credits per tick   = 100
(XEN)   ticks per tslice   = 3
(XEN)   ticks per acct     = 3
(XEN) idlers: 0xf
(XEN) stats:
(XEN)   schedule                       = 4521191
(XEN)   acct_run                       = 12233
(XEN)   acct_no_work                   = 26827
(XEN)   acct_balance                   = 7
(XEN)   acct_reorder                   = 0
(XEN)   acct_min_credit                = 0
(XEN)   acct_vcpu_active               = 4197
(XEN)   acct_vcpu_idle                 = 4197
(XEN)   vcpu_sleep                     = 16
(XEN)   vcpu_wake_running              = 140923
(XEN)   vcpu_wake_onrunq               = 0
(XEN)   vcpu_wake_runnable             = 2016395
(XEN)   vcpu_wake_not_runnable         = 0
(XEN)   vcpu_park                      = 0
(XEN)   vcpu_unpark                    = 0
(XEN)   tickle_local_idler             = 2016206
(XEN)   tickle_local_over              = 2
(XEN)   tickle_local_under             = 39
(XEN)   tickle_local_other             = 0
(XEN)   tickle_idlers_none             = 0
(XEN)   tickle_idlers_some             = 204
(XEN)   load_balance_idle              = 2432213
(XEN)   load_balance_over              = 132
(XEN)   load_balance_other             = 0
(XEN)   steal_trylock_failed           = 12730
(XEN)   steal_peer_idle                = 1197122
(XEN)   migrate_queued                 = 169
(XEN)   migrate_running                = 213
(XEN)   dom_init                       = 4
(XEN)   dom_destroy                    = 1
(XEN)   vcpu_init                      = 9
(XEN)   vcpu_destroy                   = 2
(XEN) active vcpus:
(XEN) NOW=0x000001114A1FE784
(XEN) CPU[00]  tick=117181, sort=12233, sibling=0x1, core=0x5
(XEN)   run: [32767.0] pri=-64 flags=0 cpu=0
(XEN) CPU[01]  tick=117189, sort=12233, sibling=0x2, core=0xa
(XEN)   run: [32767.1] pri=-64 flags=0 cpu=1
(XEN) CPU[02]  tick=117196, sort=12233, sibling=0x4, core=0x5
(XEN)   run: [32767.2] pri=-64 flags=0 cpu=2
(XEN) CPU[03]  tick=117176, sort=12233, sibling=0x8, core=0xa
(XEN)   run: [32767.3] pri=-64 flags=0 cpu=3


After running KB

(XEN) Scheduler: SMP Credit Scheduler (credit)
(XEN) info:
(XEN)   ncpus              = 4
(XEN)   master             = 0
(XEN)   credit             = 1200
(XEN)   credit balance     = 0
(XEN)   weight             = 0
(XEN)   runq_sort          = 42999
(XEN)   default-weight     = 256
(XEN)   msecs per tick     = 10ms
(XEN)   credits per tick   = 100
(XEN)   ticks per tslice   = 3
(XEN)   ticks per acct     = 3
(XEN) idlers: 0xf
(XEN) stats:
(XEN)   schedule                       = 8233816
(XEN)   acct_run                       = 42999
(XEN)   acct_no_work                   = 28931
(XEN)   acct_balance                   = 47
(XEN)   acct_reorder                   = 0
(XEN)   acct_min_credit                = 0
(XEN)   acct_vcpu_active               = 9963
(XEN)   acct_vcpu_idle                 = 9963
(XEN)   vcpu_sleep                     = 16
(XEN)   vcpu_wake_running              = 240904
(XEN)   vcpu_wake_onrunq               = 0
(XEN)   vcpu_wake_runnable             = 3697995
(XEN)   vcpu_wake_not_runnable         = 0
(XEN)   vcpu_park                      = 0
(XEN)   vcpu_unpark                    = 0
(XEN)   tickle_local_idler             = 3697336
(XEN)   tickle_local_over              = 18
(XEN)   tickle_local_under             = 148
(XEN)   tickle_local_other             = 0
(XEN)   tickle_idlers_none             = 0
(XEN)   tickle_idlers_some             = 669
(XEN)   load_balance_idle              = 4394421
(XEN)   load_balance_over              = 503
(XEN)   load_balance_other             = 0
(XEN)   steal_trylock_failed           = 23268
(XEN)   steal_peer_idle                = 3014315
(XEN)   migrate_queued                 = 533
(XEN)   migrate_running                = 743
(XEN)   dom_init                       = 4
(XEN)   dom_destroy                    = 1
(XEN)   vcpu_init                      = 9
(XEN)   vcpu_destroy                   = 2
(XEN) active vcpus:
(XEN) NOW=0x000001F7232EB867
(XEN) CPU[00]  tick=215790, sort=42999, sibling=0x1, core=0x5
(XEN)   run: [32767.0] pri=-64 flags=0 cpu=0
(XEN) CPU[01]  tick=215843, sort=42999, sibling=0x2, core=0xa
(XEN)   run: [32767.1] pri=-64 flags=0 cpu=1
(XEN) CPU[02]  tick=215843, sort=42999, sibling=0x4, core=0x5
(XEN)   run: [32767.2] pri=-64 flags=0 cpu=2
(XEN) CPU[03]  tick=215775, sort=42999, sibling=0x8, core=0xa
(XEN)   run: [32767.3] pri=-64 flags=0 cpu=3



--Anthony

> 
> Cheers,
> Emmanuel.

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