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Message-ID: <2891419e0905150000x5f19908eh975c83690f38b9ac@mail.gmail.com>
Date: Fri, 15 May 2009 16:00:00 +0900
From: Dong-Jae Kang <baramsori72@...il.com>
To: Ryo Tsuruta <ryov@...inux.co.jp>
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Subject: Re: [PATCH] range-bw: Another I/O scheduling policy of dm-ioband
supporting the predicable I/O bandwidth (range bandwidth)
Hi, Ryo.
Sorry for late reply.
2009/5/12 Ryo Tsuruta <ryov@...inux.co.jp>:
> Hi Dong-Jae,
>> >> after bug-fix,I evaluated range-bw according to your configuration and
>> >> test environment
>> >> the result is in new relesed range-bw mail, [PATCH 0/2]
>> >> and more detailed documentation is also available and it can be
>> >> referred in [PATCH 1/2]
>> >>
>> >> Ryo,
>> >> can you check the result ?
>
> I did the same test as before and got the results as expected.
>
> cgroup1 cgroup2
> min:max-bw 0:100 0:200
> -------------------------------------
> read 100 197
> write 103 198 [KB/s]
>
I think upper result is reasonable.
because you configured min and max bandwidth as 0K:100K(for cgroup1)
and 0K:200K(for cgroup2).
So, range-bw supported appropriate and expected bandwidth with 1~3% error range.
minimum bandwidth was satisfied (0K, 0K ) and maximum bandwidth was
limited (100K, 200K)
but there is some considered point in use of range-bw as I described
in [PATCH 0/2] as below.
* Attention
-----------------
Range-BW supports the predicable I/O bandwidth, but it should be
configured in the scope of total I/O bandwidth of the I/O system to
guarantee the minimum I/O requirement. For example, if total I/O
bandwidth is 40Mbytes/sec, the summary of I/O bandwidth configured in
each process group should be equal or smaller than 40Mbytes/sec.
So, we need to check total I/O bandwidth before set it up.
If you need more another information about range-bw, reply to me.
> I got errors while applying your patch, some lines are wrapped with
> carriage returns.
>
> +extern int policy_range_bw_init(struct ioband_device *dp, int argc,
> >> char **argv);
Thank you for bug reporting
I will check it again.
>
> Thanks,
> Ryo Tsuruta
>
--
Best Regards,
Dong-Jae Kang
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