linux-kernel - Re: [PATCH net-next 1/1] hv_netvsc: Check status in SEND_RNDIS

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Date:   Thu, 9 Feb 2023 12:21:53 -0800
From:   Jakub Kicinski <kuba@...nel.org>
To:     Haiyang Zhang <haiyangz@...rosoft.com>
Cc:     "Michael Kelley (LINUX)" <mikelley@...rosoft.com>,
        KY Srinivasan <kys@...rosoft.com>,
        "wei.liu@...nel.org" <wei.liu@...nel.org>,
        Dexuan Cui <decui@...rosoft.com>,
        "davem@...emloft.net" <davem@...emloft.net>,
        "edumazet@...gle.com" <edumazet@...gle.com>,
        "pabeni@...hat.com" <pabeni@...hat.com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-hyperv@...r.kernel.org" <linux-hyperv@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH net-next 1/1] hv_netvsc: Check status in SEND_RNDIS_PKT
 completion message

On Thu, 9 Feb 2023 19:10:16 +0000 Haiyang Zhang wrote:
> But I'm just worried about if a VM sending at high speed, and host side is,
> for some reason, not able to send them correctly, the log file will become 
> really big and difficult to download and read. With rate limit, we still see 
> dozens of messages every 5 seconds or so, and it tells you how many 
> messages are skipped. And, if the rate is lower, it won't skip anything. 
> Isn't this info sufficient to debug?
> 
> By the way, guests cannot trust the host -- probably we shouldn't allow the
> host to have a way to jam guest's log file?

+1 FWIW, the general guidance is to always rate limit prints
which may be triggered from the datapath (which I'm guessing
this is based on the names of things)