linux-kernel - Re: [PATCH v6 net-next] net: hyperv: Add attributes to show TX indirection table

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Message-ID: <20200721122127.3ce422f3@kicinski-fedora-pc1c0hjn.dhcp.thefacebook.com>
Date:   Tue, 21 Jul 2020 12:21:27 -0700
From:   Jakub Kicinski <kuba@...nel.org>
To:     Chi Song <Song.Chi@...rosoft.com>
Cc:     Stephen Hemminger <stephen@...workplumber.org>,
        David Miller <davem@...emloft.net>,
        Haiyang Zhang <haiyangz@...rosoft.com>,
        KY Srinivasan <kys@...rosoft.com>,
        Stephen Hemminger <sthemmin@...rosoft.com>,
        "wei.liu@...nel.org" <wei.liu@...nel.org>,
        "linux-hyperv@...r.kernel.org" <linux-hyperv@...r.kernel.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v6 net-next] net: hyperv: Add attributes to show TX
 indirection table

On Tue, 21 Jul 2020 04:58:59 +0000 Chi Song wrote:
> An imbalanced TX indirection table causes netvsc to have low
> performance. This table is created and managed during runtime. To help
> better diagnose performance issues caused by imbalanced tables, add
> device attributes to show the content of TX indirection tables.
> 
> Signed-off-by: Chi Song <chisong@...rosoft.com>

Sorry for waiting until v6 but sysfs feel like a very strange place to
expose this. Especially under the netdev, not the bus device.

This looks like device specific state, perhaps ethtool -d is a more
appropriate place?