Re: [Xen-devel] More on sedf scheduler

[Rob Gardner <rob.gardner@xxxxxx>]

Stephan Diestelhorst wrote:

> Thanks,
>  what is your dom0 tight loop doing? Heavy I/O?
> It looks like dom0 does a lot of I/O, which immediatelly unblocks and then 
> gets a higher priority in the L1 extraq, without anybounds on executiontime, 
> i.e. slice length. Can you confirm this?
> Stephan
>  
The loop was just while(1); There was also a python script running that 
was reading from xentrace. So no heavy i/o, at least no disk/network 
i/o. But that doesn't matter anyway. Here is another dump where dom0 is 
doing absolutely nothing besides while (1); And dom1 is completely 
comatose during this time.
Rob


(XEN) Scheduler: Simple EDF Scheduler (sedf)
(XEN) NOW=0x0000004AC8DEB496
(XEN) CPU[00] now=321199566451
(XEN) RUNQ rq ff18cf80   n: ff18cf80, p: ff18cf80
(XEN)
(XEN) WAITQ rq ff18cf88   n: ffbf7e04, p: ff1bfe04
(XEN)   0: 0.0 has=T p=20000000 sl=15000000 ddl=321220001780 w=0 
c=34111278898 sc=451020117 xtr(yes)=11730339611 ew=0 (34%)
(XEN)   1: 1.0 has=F p=100000000 sl=0 ddl=321370002222 w=0 c=20938650825 
sc=131072 xtr(yes)=20938650825 ew=1 (100%)
(XEN)
(XEN) EXTRAQ (penalty) rq ff18cf90   n: ffbf7e0c, p: ffbf7e0c
(XEN)   0: 0.0 has=T p=20000000 sl=15000000 ddl=321220001780 w=0 
c=34111278898 sc=451020117 xtr(yes)=11730339611 ew=0 (34%)
(XEN)
(XEN) EXTRAQ (utilization) rq ff18cf98   n: ff1bfe14, p: ffbf7e14
(XEN)   0: 1.0 has=F p=100000000 sl=0 ddl=321370002222 w=0 c=20938650825 
sc=131072 xtr(yes)=20938650825 ew=1 (100%)
(XEN)   1: 0.0 has=T p=20000000 sl=15000000 ddl=321220001780 w=0 
c=34111278898 sc=451020117 xtr(yes)=11730339611 ew=0 (34%)
(XEN)
(XEN) not on Q



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