netdev - Re: [PATCH net-next] net: hyperv: Add attributes to show RX/TX indirection table

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Date:   Fri, 17 Jul 2020 08:24:51 -0700
From:   Stephen Hemminger <stephen@...workplumber.org>
To:     Chi Song <Song.Chi@...rosoft.com>
Cc:     KY Srinivasan <kys@...rosoft.com>,
        Haiyang Zhang <haiyangz@...rosoft.com>,
        Stephen Hemminger <sthemmin@...rosoft.com>,
        Wei Liu <wei.liu@...nel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Martin KaFai Lau <kafai@...com>,
        Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
        Andrii Nakryiko <andriin@...com>,
        John Fastabend <john.fastabend@...il.com>,
        KP Singh <kpsingh@...omium.org>,
        "linux-hyperv@...r.kernel.org" <linux-hyperv@...r.kernel.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: [PATCH net-next] net: hyperv: Add attributes to show RX/TX
 indirection table

On Fri, 17 Jul 2020 06:04:31 +0000
Chi Song <Song.Chi@...rosoft.com> wrote:

> The network is observed with low performance, if TX indirection table is imbalance.
> But the table is in memory and set in runtime, it's hard to know. Add them to attributes can help on troubleshooting.


The receive indirection table comes from RSS configuration.
The RSS configuration is already visible via ethtool so adding sysfs support
for that is redundant.

The transmit indirection table comes from the host, and is unique
to this driver. So adding a sysfs file for that makes sense.

The format of sysfs files is that in general there should be
one value per file.

One other possibility would be to make these as attributes under each
queues. But that is harder.