Not to beat a dead horse, but ...

[Andreas Nilsson]

On Sun, Jun 8, 2014 at 8:15 PM, George Mitchell <george+freebsd at m5p.com>
wrote:

> When I run this command on 10-STABLE on a uniprocessor system while
> running the misc/dnetc port:
>
> cd /usr/src
> time make buildworld && time make buildkernel && time make installkernel
>
> On revision 266422 with SCHED_ULE, I get (showing the time lines only):
>
> 7045.988u 897.681s 4:00:33.89 55.0%     29430+492k 27927+17003io
> 30943pf+519w
> 1155.683u 149.422s 52:49.60 41.1%       25418+410k 7452+20843io
> 12166pf+248w
> 7.101u 4.838s 8:03.57 2.4%      5905+221k 1179+9461io 1345pf+67w
>
> On revision 267211 with SCHED_4BSD:
>
> 6950.087u 665.074s 2:40:36.19 79.0%     29929+502k 33651+17368io
> 31151pf+151w
> 1148.066u 134.312s 26:40.95 80.1%       26234+426k 9681+24613io
> 11917pf+106w
> 6.774u 4.369s 0:33.90 32.8%     3110+320k 1388+10979io 1514pf+3w
>
> Since the majority of my systems are uniprocessors and I like to
> run dnetc, SCHED_ULE has been a dealbreaker for me since day one.
> Consequently I can't use freebsd_update.
>
> The party line seems to be, "Well, everybody knows SCHED_ULE sucks
> on uniprocessors."  Hello?  Not everybody has upgraded to multiple
> core or hyperthreaded processors yet.  Do we really want to write
> off every uniprocessor piece of hardware out here?
>
Yes? Can you even buy a system today that is uniprocessor? My phone is a
dual core thing, and it got written of because of its "meagre" hardware.
Top of the line phones has 8 cores. So, seriously, what non-ancient system
have you acquired that is uniprocessor? Please include links for available
hardware for laptops, desktops or servers.
/A

>
> The other assertion I hear is that SCHED_ULE really excels on some
> unspecified workload or other.  I'd love to see exactly how much
> better it does than 4BSD on these mythological loads.    -- George
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