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From: Weiping Zhang <zwp10758@gmail.com>
To: Tejun Heo <tj@kernel.org>
Cc: Jens Axboe <axboe@kernel.dk>,
	linux-block@vger.kernel.org, cgroups@vger.kernel.org
Subject: Re: [RFC 0/3] blkcg: add blk-iotrack
Date: Fri, 27 Mar 2020 00:27:11 +0800
Message-ID: <CAA70yB66fBdAOnv+8rXauwbuPu+UY+gr9ZKeSsQNgq+ZHhJn3Q@mail.gmail.com> (raw)
In-Reply-To: <20200326161328.GN162390@mtj.duckdns.org>

Tejun Heo <tj@kernel.org> 于2020年3月27日周五 上午12:15写道:
>
> On Thu, Mar 26, 2020 at 11:08:45PM +0800, Weiping Zhang wrote:
> > But iocost_test1 cannot get 8/(8+1) iops,  and the total disk iops
> > is 737559 < 79388, even I change rrandiops=637000.
>
> iocost needs QoS targets set especially for deep queue devcies. W/o QoS targets,
> it only throttles when QD is saturated, which might not happen at all depending
> on fio job params.
>
> Can you try with sth like the following in io.cost.qos?
>
>   259:0 enable=1 ctrl=user rpct=95.00 rlat=5000 wpct=50.00 wlat=10000
>
> In case you see significant bw loss, step up the r/wlat params.
>
OK, I'll try it.

I really appreciate that if you help review blk-iotrack.c, or just
drop io.iotrakc.stat
and append these  statistics to the io.stat? I think these metrics is usefull,
and it just extend io.stat output.

Thanks a ton

  reply index

Thread overview: 13+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-03-21  1:20 Weiping Zhang
2020-03-21  1:21 ` [RFC 1/3] update the real issue size when bio_split Weiping Zhang
2020-03-21  1:21 ` [RFC 2/3] bio: track timestamp of submitting bio the disk driver Weiping Zhang
2020-03-21  1:21 ` [RFC 3/3] blkcg: add blk-iotrack Weiping Zhang
2020-03-24 18:27 ` [RFC 0/3] " Tejun Heo
2020-03-25 12:49   ` Weiping Zhang
2020-03-25 14:12     ` Tejun Heo
2020-03-25 16:45       ` Weiping Zhang
2020-03-26 15:08         ` Weiping Zhang
2020-03-26 16:14           ` Tejun Heo
2020-03-26 16:27             ` Weiping Zhang [this message]
2020-03-31 14:19               ` Tejun Heo
2020-03-27  6:27 ` [RFC PATCH v2 " Weiping Zhang

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