Re: [PATCH 2/2] NBD: allow hung network I/O to be cancelled

[Mike Snitzer]

On 8/24/07, Paul Clements <paul.clements@xxxxxxxxxxxx> wrote:
> This patch allows NBD I/O to be cancelled when a network outage occurs.
> Previously, I/O would just hang, and if enough I/O was hung in nbd, the
> system (at least user-level) would completely hang until a TCP timeout
> (default, 15 minutes) occurred.
>
> The patch introduces a new ioctl NBD_SET_TIMEOUT that allows a transmit
> timeout value (in seconds) to be specified. Any network send that
> exceeds the timeout will be cancelled and the nbd connection will be
> shut down. I've tested with various timeout values and 6 seconds seems
> to be a good choice for the timeout. If the NBD_SET_TIMEOUT ioctl is not
> called, you get the old (I/O hang) behavior.

Hi Paul,

Thanks for implementing this!  Do you happen to have an associated
nbd-client patch for userspace?  If not I'd be happy to coordinate
with you and Wouter on a patch.

regards,
Mike
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