SCHED_ULE?

[Rui Paulo-3]

Hi,
I guess this has been discussed in the past but, can't we turn on ULE  
on ARM embedded systems ? What's the bottleneck or performance  
regression (assuming there's one) ?

--
Rui Paulo

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[Olivier Houchard-3]

On Sun, Nov 08, 2009 at 01:30:48PM +0000, Rui Paulo wrote:
> Hi,
> I guess this has been discussed in the past but, can't we turn on ULE  
> on ARM embedded systems ? What's the bottleneck or performance  
> regression (assuming there's one) ?
>
> --
> Rui Paulo

Hi,

At one point ULE was buggy on arm, but I think it's been fixed like years ago,
so it should be safe to use it.

Regards,

Olivier

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[Sam Leffler]

Olivier Houchard wrote:

> On Sun, Nov 08, 2009 at 01:30:48PM +0000, Rui Paulo wrote:
>> Hi,
>> I guess this has been discussed in the past but, can't we turn on ULE  
>> on ARM embedded systems ? What's the bottleneck or performance  
>> regression (assuming there's one) ?
>>
>> --
>> Rui Paulo
>
> Hi,
>
> At one point ULE was buggy on arm, but I think it's been fixed like years ago,
> so it should be safe to use it.

Last I measured it was slower than 4BSD on my xscale boards (not much
but measurable).  This was mostly doing network packet pushing
(wired+wireless).

        Sam
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[Rui Paulo-3]

Hi,

On 10 Nov 2009, at 04:38, Sam Leffler wrote:

> Olivier Houchard wrote:
>> On Sun, Nov 08, 2009 at 01:30:48PM +0000, Rui Paulo wrote:
>>> Hi,
>>> I guess this has been discussed in the past but, can't we turn on ULE  on ARM embedded systems ? What's the bottleneck or performance  regression (assuming there's one) ?
>>>
>>> --
>>> Rui Paulo
>> Hi,
>> At one point ULE was buggy on arm, but I think it's been fixed like years ago,
>> so it should be safe to use it.
>
> Last I measured it was slower than 4BSD on my xscale boards (not much but measurable).  This was mostly doing network packet pushing (wired+wireless).

I also tested this on the Cambria board and I concluded the same (I used sysbench).

--
Rui Paulo

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[M. Warner Losh]

In message: <43EE151E-574E-4A17-9946-0BC5A6B3BC69@...>
            Rui Paulo <rpaulo@...> writes:
: Hi,
:
: On 10 Nov 2009, at 04:38, Sam Leffler wrote:
:
: > Olivier Houchard wrote:
: >> On Sun, Nov 08, 2009 at 01:30:48PM +0000, Rui Paulo wrote:
: >>> Hi,
: >>> I guess this has been discussed in the past but, can't we turn on ULE  on ARM embedded systems ? What's the bottleneck or performance  regression (assuming there's one) ?
: >>>
: >>> --
: >>> Rui Paulo
: >> Hi,
: >> At one point ULE was buggy on arm, but I think it's been fixed like years ago,
: >> so it should be safe to use it.
: >
: > Last I measured it was slower than 4BSD on my xscale boards (not much but measurable).  This was mostly doing network packet pushing (wired+wireless).
:
: I also tested this on the Cambria board and I concluded the same (I used sysbench).

This isn't too surprising, since it is optimized for multicore and
4BSD grew up on single-core systems...

Warner


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