Re: dummynet = local taffic > 100ms - help!

From: Mike Silbersack (silby_at_silby.com)
Date: 02/11/04

  • Next message: Bruce Evans: "Re: dummynet = local taffic > 100ms - help!" 
    Date: Wed, 11 Feb 2004 10:07:13 -0600 (CST)
To: richard@wendland.org.uk

    On Wed, 11 Feb 2004, Richard Wendland wrote:

    > Well, with HZ=10000 RFC1323 TCP connections will stop after 59.7 hours,
    > with HZ=100000 after 6 hours. For those with long running TCP connections
    > (eg remote backup) that could be a big deal. See 4.2.3 of RFC1323.
    >
    > It does seem quite a few people want HZ>1000 so I think the time has
    > come to isolate the TCP timestamp option clock from the HZ value to
    > avoid this problem. For now they should set net.inet.tcp.rfc1323=0 to
    > avoid breaking RFC1323.
    >
    > Note this doesn't affect routed packets, only TCP connections to/from
    > that host.
    >
    > Tom Pavel sent some patches to this list on 14 Jan 2004 that he has been
    > using to overcome this HZ/RFC1323 problem.
    >
    > Richard
    > --
    > Richard Wendland richard@wendland.org.uk

    I'm aware of those patches, looking at and committing them is on my to-do
    list. I don't have any immediate plans to work on it, although I will
    make sure to get it in before 5.3.

    Mike "Silby" Silbersack
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  • Next message: Bruce Evans: "Re: dummynet = local taffic > 100ms - help!"