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Re: [Qemu-devel] PATCH: enabling TCP keepalives - v3
From: |
David Ahern |
Subject: |
Re: [Qemu-devel] PATCH: enabling TCP keepalives - v3 |
Date: |
Mon, 04 May 2009 20:59:09 -0600 |
User-agent: |
Thunderbird 2.0.0.21 (X11/20090320) |
Jamie Lokier wrote:
>> The parameters I put in cause a drop after 2 minutes of no response --
>> 60 seconds of idle (no data through the socket) followed by 60 seconds
>> of failed probes. The default parameters for linux are harsh: 7 hours of
>> idle time before the first keepalive is sent.
>
> Is 7 hours a problem worth overriding the kernel defaults for? How
> many old VNC sessions are likely to get accumulated in that time?
The linux default is 7200 seconds; I'm not sure how I manage to convert
7200 seconds to 7 hours.
>
> 2 minutes is a bit fast for a truly idle session, but as I said in
> another response, if you have data sent by either end, then the
> session will be broken by the lack of response in about 2 minutes
> anyway - without keepalives.
Version 5 of the patch drops the changes to the timers and the missed
probes count; it only enables tcp keepalives and the probes are sent
based on OS defaults.
david
>
> -- Jamie
- Re: [Qemu-devel] PATCH: enabling TCP keepalives - v3, Richard W.M. Jones, 2009/05/01
- Re: [Qemu-devel] PATCH: enabling TCP keepalives - v3, Jamie Lokier, 2009/05/01
- Re: [Qemu-devel] PATCH: enabling TCP keepalives - v3, David Ahern, 2009/05/01
- Re: [Qemu-devel] PATCH: enabling TCP keepalives - v3, Avi Kivity, 2009/05/01
- Re: [Qemu-devel] PATCH: enabling TCP keepalives - v3, John Haxby, 2009/05/01
- Re: [Qemu-devel] PATCH: enabling TCP keepalives - v3, Jamie Lokier, 2009/05/04
- Re: [Qemu-devel] PATCH: enabling TCP keepalives - v3, Anthony Liguori, 2009/05/01
- Re: [Qemu-devel] PATCH: enabling TCP keepalives - v3, David Ahern, 2009/05/01
- Re: [Qemu-devel] PATCH: enabling TCP keepalives - v3, Anthony Liguori, 2009/05/01
- Re: [Qemu-devel] PATCH: enabling TCP keepalives - v3, Paul Brook, 2009/05/01
- Re: [Qemu-devel] PATCH: enabling TCP keepalives - v3, Anthony Liguori, 2009/05/01
- Re: [Qemu-devel] PATCH: enabling TCP keepalives - v3, Paul Brook, 2009/05/01
- Re: [Qemu-devel] PATCH: enabling TCP keepalives - v3, David Ahern, 2009/05/01