netdev - Re: [PATCH net] i40e: introduce pseudo number of cpus for compatibility

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Date:   Thu, 15 Jul 2021 10:33:42 +0800
From:   Jason Xing <kerneljasonxing@...il.com>
To:     "Nguyen, Anthony L" <anthony.l.nguyen@...el.com>
Cc:     "davem@...emloft.net" <davem@...emloft.net>,
        "andrii@...nel.org" <andrii@...nel.org>,
        "john.fastabend@...il.com" <john.fastabend@...il.com>,
        "daniel@...earbox.net" <daniel@...earbox.net>,
        "kafai@...com" <kafai@...com>, "hawk@...nel.org" <hawk@...nel.org>,
        "Brandeburg, Jesse" <jesse.brandeburg@...el.com>,
        "ast@...nel.org" <ast@...nel.org>,
        "kuba@...nel.org" <kuba@...nel.org>, "yhs@...com" <yhs@...com>,
        "songliubraving@...com" <songliubraving@...com>,
        "kpsingh@...nel.org" <kpsingh@...nel.org>,
        "xingwanli@...ishou.com" <xingwanli@...ishou.com>,
        "lishujin@...ishou.com" <lishujin@...ishou.com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "intel-wired-lan@...ts.osuosl.org" <intel-wired-lan@...ts.osuosl.org>,
        "bpf@...r.kernel.org" <bpf@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH net] i40e: introduce pseudo number of cpus for compatibility

On Thu, Jul 15, 2021 at 4:52 AM Nguyen, Anthony L
<anthony.l.nguyen@...el.com> wrote:
>
> On Fri, 2021-07-09 at 15:13 +0800, Jason Xing wrote:
> > Oh, one more thing I missed in the last email is that all the
> > failures
> > are happening on the combination of X722 10GbE and 1GbE. So the value
> > of @num_tx_qp  the driver fetches is 384 while the value is 768
> > without x722 1GbE.
> >
> > I get that information back here:
> > $ lspci | grep -i ether
> > 5a:00.0 Ethernet controller: Intel Corporation Ethernet Connection
> > X722 for 10GbE SFP+ (rev 09)
> > 5a:00.1 Ethernet controller: Intel Corporation Ethernet Connection
> > X722 for 10GbE SFP+ (rev 09)
> > 5a:00.2 Ethernet controller: Intel Corporation Ethernet Connection
> > X722 for 1GbE (rev 09)
> > 5a:00.3 Ethernet controller: Intel Corporation Ethernet Connection
> > X722 for 1GbE (rev 09)
> >
> > I know it's really stupid to control the number of online cpus, but
> > finding a good way only to limit the @alloc_queue_pairs is not easy
> > to
> > go. So could someone point out a better way to fix this issue and
> > take
> > care of some relatively old nics with the number of cpus increasing?
>
> Hi Jason,
>
> Sorry for the slow response; I was trying to talk to the i40e team
> about this.

Thanks for your kind help really. It indeed has a big impact on thousands
of machines.

>
> I agree, the limiting of number of online CPUs doesn't seem like a
> solution we want to pursue. The team is working on a patch that deals

As I said above, if the machine is equipped with only 10GbE nic, the maximum
online cpus would be 256 and so on. For now, it depends on the num of cpus.

> with the same, or similiar, issue; it is reworking the allocations of
> the queue pile. I'll make sure that they add you on the patch when it

It's not easy to cover all kinds of cases. But I still believe it's
the only proper
way to fix the issue. Looking forward to your patch :)

> is sent so that you can try this and see if it resolves your issue.
>

Yeah, sure, I will double-check and then see if it's really fixed.

Thanks,
Jason

> Thanks,
> Tony
>