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    SubjectRe: [PATCH] tcp: Implement a two-level initial RTO as per draft RFC 2988bis-02.
    On Wed, May 18, 2011 at 11:36 PM, Alexander Zimmermann
    <> wrote:
    > If you set the initRTO=0.1s, it's good for me but bad for the rest of the
    > world. That's the difference.
    > Or do you want to implement a lower barrier of 1sec so that you can ensure
    > that nobody set the initRTO lower than 1s?

    Oh, I see. Yes, there is a lower bound (and an upper bound) on what
    values the kernel will accept as initRTO. In the patch "Implement a
    two-level initial RTO as per draft RFC 2988bis-02" above, I re-used
    TCP_RTO_MIN and TCP_RTO_MAX in net/ipv4/sysctl_net_ipv4.c in order to
    prevent users from setting a minRTO that's outside this range. They
    are defined as follows in tcp.h:

    #define TCP_RTO_MAX ((unsigned)(120*HZ))
    #define TCP_RTO_MIN ((unsigned)(HZ/5))

    So we're talking about a [200ms ; 120s] range no matter what.

    Benoit "tsuna" Sigoure
    Software Engineer @

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