On Mon, Apr 27, 2009 at 11:39 PM, Ananth <
cbananth@xxxxxxxxx> wrote:
> Hi,
> Thanks for your suggestion. I was able to change scheduler from credit to
> sedf. "sched" is the correct parameter.
> However when I try to select sched=rrobin, the system gets ready to boot and
> then everything goes blank. I have attached the round robin scheduler code
> along with this mail. Could you give me your feedback on whether I have
> missed out something.
>
> Thank you very much once again.
>
> Warm Regards
> Ananth
>
> On Tue, Apr 28, 2009 at 2:11 AM, George Dunlap <
dunlapg@xxxxxxxxx> wrote:
>>
>> You need to pass the arguments to xen on the xen command line, not the
>> dom0 kernel command line. So the following line should be:
>>
>> kernel /boot/xen.gz sched=rrobin
>>
>> (I haven't checked to make sure that "sched" is the right parameter.)
>>
>> -George
>>
>> On Mon, Apr 27, 2009 at 7:39 PM, Ananth <
cbananth@xxxxxxxxx> wrote:
>> > Hi,
>> > In continuation with my previous post, I am able to login to the
>> > compiled
>> > Xen. But it is continuing to run on credit scheduler even if i modify
>> > the
>> > kernel parameters to run using round robin scheduler.
>> > I have pasted the contents of the /boot/grub/menu.lst file.
>> >
>> > title Xen -- openSUSE 11.0 - 2.6.18.8 manually compiled AGAIN
>> > root (hd0,4)
>> > kernel /boot/xen.gz
>> > module /boot/vmlinuz-2.6.18.8-xen0
>> > root=/dev/disk/by-id/scsi-SATA_Hitachi_HTS5416_SB2D04E4CE7YEE-part5
>> > showopts
>> > sched=rrobin vga=0x314
>> > module /boot/initrd-2.6.18-xen0
>> >
>> > Incidentally, even if i give sched=sedf, it still runs only on credit
>> > scheduler. Please let me know your feedback on this issue. My aim is to
>> > study the performance statistics of credit, sedf and new RR scheduler.
>> > It
>> > would be great if you could give me any pointers to measure scheduler
>> > performance or get statistics from the system.
>> >
>> > Thanks & Regards
>> > Ananth
>> >
>> > ---------- Forwarded message ----------
>> > From: Ananth <
cbananth@xxxxxxxxx>
>> > Date: Mon, Apr 27, 2009 at 6:45 PM
>> > Subject: Re: [Xen-devel] Fwd: Error while compiling with new RR
>> > scheduler
>> > To: George Dunlap <
dunlapg@xxxxxxxxx>
>> > Cc: "
xen-devel@xxxxxxxxxxxxxxxxxxx" <
xen-devel@xxxxxxxxxxxxxxxxxxx>
>> >
>> >
>> > Hello,
>> > Thank you so much for pointing it out. How could I miss something so
>> > obvious. I am able to compile it now. I will get back to you in case I
>> > get
>> > into any issues during run time.
>> >
>> > Thank you.
>> >
>> > Regards
>> > Ananth
>> >
>> > On Mon, Apr 27, 2009 at 6:29 PM, George Dunlap <
dunlapg@xxxxxxxxx>
>> > wrote:
>> >>
>> >> The message says it pretty clearly: you return the value of ret, but
>> >> there are control paths in the function for which ret.task is not set.
>> >> Namely, if list_empty(runq) is true, then you will return an
>> >> uninitialized value, which may be anything (garbage on the stack,
>> >> NULL, &c). This will most likely cause Xen to crash, as
>> >> xen/common/schedule.c assumes that ret.task will be a valid, non-NULL
>> >> pointer.
>> >>
>> >> If you happen to know that runq is never empty, then you don't need
>> >> the if statement. If it may be empty, then you need an else clause to
>> >> return the idle vcpu for that processor.
>> >>
>> >> -George
>> >>
>> >> 2009/4/24 Ananth <
cbananth@xxxxxxxxx>:
>> >> > Hi,
>> >> > I figured out that the error was because of a missing ' ; ' . This
>> >> > has
>> >> > been fixed now. I have attached the modified code.
>> >> > While compiling I am getting the below error message.
>> >> >
>> >> > cc1: warnings being treated as errors
>> >> > sched_rrobin.c: In function ‘rrobin_schedule’:
>> >> > sched_rrobin.c:74: error: ‘ret.task’ may be used uninitialized in
>> >> > this
>> >> > function
>> >> >
>> >> > Please guide.
>> >> >
>> >> > Thanks & Regards
>> >> > Ananth
>> >> >
>> >> >
>> >> > ---------- Forwarded message ----------
>> >> > From: Ananth <
cbananth@xxxxxxxxx>
>> >> > Date: Fri, Apr 24, 2009 at 7:25 PM
>> >> > Subject: Error while compiling with new RR scheduler
>> >> > To: "
xen-devel@xxxxxxxxxxxxxxxxxxx" <
xen-devel@xxxxxxxxxxxxxxxxxxx>
>> >> >
>> >> >
>> >> > Hi,
>> >> > Please find attached the source code of Round Robin scheduler which I
>> >> > am
>> >> > trying to add to Xen 3.3.1.
>> >> > I am facing the following error messages while compiling the same.
>> >> >
>> >> > sched_rrobin.c:31: error: two or more data types in declaration
>> >> > specifiers
>> >> >
>> >> > sched_rrobin.c: In function ‘rrobin_vcpu_init’:
>> >> >
>> >> > sched_rrobin.c:34: error: incompatible types in return
>> >> >
>> >> > sched_rrobin.c:51: error: incompatible types in return
>> >> >
>> >> > sched_rrobin.c:94: error: initialization from incompatible pointer
>> >> > type
>> >> >
>> >> > I believe the error in line 94 is causing the rest of the error
>> >> > messages. I have checked with the structure definition in sched-if.h
>> >> > as well
>> >> > as the implementation of the same in other schedulers such as SEDF
>> >> > and
>> >> > Credit.
>> >> >
>> >> > Request you to kindly provide your feedback regarding the same.
>> >> >
>> >> > Thanks & Regards
>> >> > Ananth
>> >> >
>> >> >
>> >> > _______________________________________________
>> >> > Xen-devel mailing list
>> >> >
Xen-devel@xxxxxxxxxxxxxxxxxxx
>> >> >
http://lists.xensource.com/xen-devel
>> >> >
>> >> >
>> >
>> >
>> >
>
>
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