19 Jun
2020
19 Jun
'20
6:59 a.m.
Hi,
I am trying to use CEPH dmclock to see how it works for QoS control. Especially, I want to
set “osd_op_queue” as “mclock_client” to config different [r, w, l] for each client. The
CEPH version I use is nautilus 14.2.9.
I noticed that in "OSD CONFIG REFERENCE" section of CEPH documentation, it
states that "the mClock based ClientQueue (mclock_client) also incorporates the
client identifier in order to promote fairness between clients.", so I believe
librados can support per-client configurations right now. I wonder how I can set up the
CEPH configuration to config different (r, w, l) for different clients using such “client
identifier"? Thanks.
Best,
Zhenbo Qiao
30 Jul
30 Jul
11:45 p.m.
On Jun 19, 2020, at 12:59 AM, qjpqzb(a)gmail.com wrote:
Hi,
I am trying to use CEPH dmclock to see how it works for QoS control. Especially, I want
to set “osd_op_queue” as “mclock_client” to config different [r, w, l] for each client.
The CEPH version I use is nautilus 14.2.9.
That feature was never fully realized and did not support setting reservation, weight, and
limit for each client. At best it simply kept a separate queue for each client so each
client’s tags would increment independently thereby promoting some “fairness" between
clients.
And as I look at master, it appears that the mclock scheduler was re-worked by Sam Just
and that feature is no longer there.
I noticed that in "OSD CONFIG REFERENCE"
section of CEPH documentation, it states that "the mClock based ClientQueue
(mclock_client) also incorporates the client identifier in order to promote fairness
between clients.", so I believe librados can support per-client configurations right
now. I wonder how I can set up the CEPH configuration to config different (r, w, l) for
different clients using such “client identifier"? Thanks.
I’d started an effort to allow client configuration via librados but needed to move onto
other rgw-centered tasks. Sam was looking at that code but I don’t know where he went with
it.
Best,
Eric
3 Aug
3 Aug
8:52 p.m.
There's an initial implementation sitting around in a branch
(https://github.com/athanatos/ceph/tree/sjust/wip-dmclock-librados-rebase),
but it still needs a lot of work. In short, it's not ready in current
master.
-Sam
On Thu, Jul 30, 2020 at 2:45 PM Eric Ivancich <ivancich(a)redhat.com> wrote:
On Jun 19, 2020, at 12:59 AM, qjpqzb(a)gmail.com
wrote:
Hi,
I am trying to use CEPH dmclock to see how it works for QoS control. Especially, I want
to set “osd_op_queue” as “mclock_client” to config different [r, w, l] for each client.
The CEPH version I use is nautilus 14.2.9.
That feature was never fully realized and did not support setting reservation, weight,
and limit for each client. At best it simply kept a separate queue for each client so each
client’s tags would increment independently thereby promoting some “fairness" between
clients.
And as I look at master, it appears that the mclock scheduler was re-worked by Sam Just
and that feature is no longer there.
I noticed that in "OSD CONFIG
REFERENCE" section of CEPH documentation, it states that "the mClock based
ClientQueue (mclock_client) also incorporates the client identifier in order to promote
fairness between clients.", so I believe librados can support per-client
configurations right now. I wonder how I can set up the CEPH configuration to config
different (r, w, l) for different clients using such “client identifier"? Thanks.
I’d started an effort to allow client configuration via librados but needed to move onto
other rgw-centered tasks. Sam was looking at that code but I don’t know where he went with
it.
Best,
Eric
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2 comments
3 participants
participants (3)
-
Eric Ivancich -
qjpqzb＠gmail.com -
Sam Just