Re: Sync semantics.

[Pavel Machek]

Hi!

> What should I expect from a "sync" system call?
> 
> The manual says: 
> 
>    sync() first commits inodes to buffers, and then buffers to disk.
> 
> and then goes on to state: 
> 
>    ... since  version  1.3.20 Linux does actually wait.
> 
> [for the buffers to be handed over to the drive]
> 
> So how long can I expect a "sync" call to take? 
> 
> I would expect that all buffers that are dirty at the time of the
> "sync" call are written by the time that sync returns. I'm currently
> bombarding my fileserver with some 40-60Mbytes per second of data to
> be written (*). The fileserver has 8G of memory. So max 8000 Mb of

Are you sure? Hitting 40MB/sec is hard when it involves seeking...

You may want to lower dirty_ratio...
-- 
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