From: "Morten Brørup" <mb@smartsharesystems.com>
To: "Ferruh Yigit" <ferruh.yigit@amd.com>,
"Stephen Hemminger" <stephen@networkplumber.org>
Cc: "Bruce Richardson" <bruce.richardson@intel.com>,
"dev" <dev@dpdk.org>, "Thomas Monjalon" <thomas@monjalon.net>
Subject: RE: Per queue stats
Date: Tue, 8 Oct 2024 11:58:37 +0200 [thread overview]
Message-ID: <98CBD80474FA8B44BF855DF32C47DC35E9F796@smartserver.smartshare.dk> (raw)
In-Reply-To: <419d9a04-e733-44ab-b183-96ac7777d5b4@amd.com>
> From: Ferruh Yigit [mailto:ferruh.yigit@amd.com]
> Sent: Sunday, 6 October 2024 22.51
>
> On 10/4/2024 9:40 PM, Stephen Hemminger wrote:
> > ...
> >>>>> The stats queue mapping was a feature that was hinted at being
> removed.
> >>>>> It only exists because of HW limitations on Intel ixgbe NIC and
> SW
> >>>>> limitations from RTE_ETHDEV_QUEUE_STAT_CNTRS.
> >>>>>
> >>>>
> >>>>
> >>>> We have a plan to remove 'RTE_ETHDEV_QUEUE_STAT_CNTRS', by moving
> queue
> >>>> stats to xstats.
> >>>>
> >>>> But ixgbe limitation is there.
> >>>>
> >>>>> Perhaps there should be a generic SW emulation for this the
> mapping?
> >>>>>
> >>>>
> >>>> Ack, cc'ed Bruce.
> >>>> But I am not sure ROI of the effort at this stage.
> >>>
> >>> Not sure what the specific ask for me is here. :-) Overall, I think
> moving
> >>> queue stats to xstats is the best way to go.
> >>>
> >>
> >> cc'ed because of "generic SW emulation" comment.
> >>
> >> I was thinking if this mapping can be done transparent to the user
> by
> >> driver mapping queue <-> stats_register before reading stats, but
> @Bruce
> >> let me know this won't work because the stats tracking only happens
> >> after the mapping.
> >>
> >> @Stephen, do you have something specific in your mind for SW
> emulation
> >> for mapping?
> >
> > Probably not worth doing mapping tables for SW drivers.
> >
> > My preference would be something like:
> > 1. Introduce new API's rte_ethdev_get_queue_stats() and
> rte_ethdev_reset_queue_stats().
> > with callbacks in ethdev ops.
> > if driver does not support this, then do a shim in ethdev
> that uses old stats fields.
> > 2. Mark the stats mapping API's as deprecated and always
> return error.
> > Making special case for ixgbe at this point really is not
> worth maintaining.
> > 3. After all drivers converted over, drop the fields in
> ethdev stats for queues.
> > And fix the examples, etc. Yes this would be a big API
> change.
> >
> > Would take a year to get done (ie 25.11).
> >
>
> The problem with existing a API, 'rte_eth_stats_get()', is it has queue
> stats fixed sized array which limits us also for some cases causes
> unnecessary memory consumption.
>
> Our solution for now is move queue stats to xstats, as it is flexible
> this solves the problem, but as you said in other thread xstats is free
> form and may be hard for the application to use it.
>
> One option is we can add some more data to the xstats, to help
> application to consume it easier, like number of queues just before the
> queue stats and define queue stats formatting syntax.
>
> But if we will go with API option, instead of adding new queue stats
> ('rte_ethdev_get_queue_stats()'), we can update the existing
> 'rte_eth_stats_get()' to return dynamic number of queue stats.
Some users might not care about queue stats, so let's remove them entirely from rte_eth_stats_get(), and put them elsewhere.
>
> And we need to find someone to own this task.
>
>
> Above is for queue stats, it does not solve the mapping issue, as we
> need it for a few drivers and we already have the APIs, I am for just
> keeping them as it is, they are not causing any burden to us.
next prev parent reply other threads:[~2024-10-08 9:58 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-09-04 15:42 [PATCH] doc: update TAP device features Stephen Hemminger
2024-10-04 1:48 ` Ferruh Yigit
2024-10-04 2:26 ` Stephen Hemminger
2024-10-04 4:09 ` Ferruh Yigit
2024-10-04 7:54 ` Bruce Richardson
2024-10-04 15:24 ` Stephen Hemminger
2024-10-04 17:26 ` Ferruh Yigit
2024-10-04 20:40 ` Per queue stats Stephen Hemminger
2024-10-06 20:51 ` Ferruh Yigit
2024-10-08 9:58 ` Morten Brørup [this message]
2024-10-08 10:04 ` Bruce Richardson
2024-10-04 20:48 ` [PATCH] doc: update TAP device features Stephen Hemminger
2024-10-06 20:36 ` Ferruh Yigit
2024-10-09 16:53 ` Stephen Hemminger
2024-10-09 23:21 ` Ferruh Yigit
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