netdev - Re: [PATCH net] sctp: not allow to set rto

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Message-ID: <20180529180257.GE3788@localhost.localdomain>
Date:   Tue, 29 May 2018 15:02:57 -0300
From:   Marcelo Ricardo Leitner <marcelo.leitner@...il.com>
To:     Xin Long <lucien.xin@...il.com>
Cc:     Neal Cardwell <ncardwell@...gle.com>,
        Michael Tuexen <michael.tuexen@...chi.franken.de>,
        Neil Horman <nhorman@...driver.com>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Netdev <netdev@...r.kernel.org>, linux-sctp@...r.kernel.org,
        David Miller <davem@...emloft.net>,
        David Ahern <dsa@...ulusnetworks.com>,
        Eric Dumazet <edumazet@...gle.com>,
        syzkaller <syzkaller@...glegroups.com>
Subject: Re: [PATCH net] sctp: not allow to set rto_min with a value below
 200 msecs

On Wed, May 30, 2018 at 01:45:08AM +0800, Xin Long wrote:
> If we're counting on max_t to fix this CPU stuck. It should not that
> matter if min rto < the value causing that stuck.

Yes but putting a floor to rto_{min,max} now is to protect the rtx
timer now, not the heartbeat one.

> 
> >
> > Anyway, what about we add a floor to rto_max too, so that RTO can
> > actually grow into something bigger that don't hog the CPU? Like:
> > rto_min floor = 5ms
> > rto_max floor = 50ms
> >
> >   Marcelo
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