Re: [Nbd] question about i/o scheduling

[Paul Clements <paul.clements@...124...>]

On Tue, Aug 3, 2010 at 2:04 PM, Peter Simons <simons@...813...> wrote:

> Now, it looks to me like my kernel performs too much write-buffering.
> When a large file is copied to an nbd-mounted partition, the initial 2
> MB or so are transferred at incredible speed; apparently, because the
> kernel just buffers the data. At one point, the kernel actually tries to
> transfer the data to the remote host, but that takes several minutes.
> During that time, the nbd-device is almost unusable for other processes
> because it accepts no more writes at all (and reads have a hard time
> getting through the network connection).

So you're wanting to prioritize one process's I/O against others? Have
you tried "ionice"ing the process(es) in question?

--
Paul


> Has anyone else observed that phenomenon? Is there maybe a way to
> improve the situation?
>
> Take care,
> Peter
>
>
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