[OpenAFS-devel] Performance of Thunderbird on windows with mail folders stored in AFS

[Jeffrey Altman]

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On 6/28/2012 2:37 PM, Douglas E. Engert wrote:
> The OpenAFS Change log says:
>=20
>     Since 1.7.1100 (1.7.11)
>     * Treat all cached writes as write-through

This is write-through to the AFS cache from the Windows page cache;
not write-through to the file server.  In any case, it is a performance
hit but is a necessary one.  Otherwise, it is possible for the page
cache to fill with data intended for AFS and it become impossible for
the pages to be cleared in a timely fashion to make room for non-AFS
data.  The page cache is quite often many multiples in size of the
AFS cache.

The change was made in 1.7.12 not 1.7.11.

Jeffrey Altman


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