[OpenAFS-win32-devel] Please test this build

[Jeffrey Altman]

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there was a missing lock in the 1.4.1c builds.   1.4.1d is now available
for download.  Please test.

Jeffrey Altman


Jeffrey Altman wrote:
> Over the last two weeks in response to the openafs-info thread
> describing "delayed write errors" from Microsoft Office applications
> I have made three changes to OpenAFS for Windows:
> 
> (1) Removed the deadlock that was the cause of the "delayed write
>     errors" that initiated the thread.  The "delayed write errors"
>     in this case were being caused by a deadlock on one smb_fid_t
>     object that prevented reads, writes, etc from being performed
>     on the file that Microsoft Office was attempting to write to.
> 
> (2) In the more general case, delayed write errors can occur when
>     a smb_Server thread that is processing a Windows CIFS request
>     is starved for CPU time because it is simply incredibly unlucky
>     when trying to obtain a mutex, lock, etc.   To help prevent this
>     situation thread priorities are now dynamically adjusted based
>     upon the age of the CIFS request.  This helps older requests
>     win out over younger requests when attempting to obtain resources.
> 
> (3) It was observed that when multiple requests on the same file
>     are being processed that the smb_Server threads spend most of
>     their time fighting over mutex objects and not performing I/O.
>     This was because the mutex objects were being held across
>     cm_SyncOp() and AFS RPC calls which tend to block.  Releasing
>     the mutex across these calls will allow for simultaneous requests
>     to the AFS File Server on the same file.  This is turn will
>     improve performance.
> 
> I have tagged a set of sources in cvs as openafs-stable-1_4_1c.
> Installers for this build are available at
> 
> http://web.mit.edu/jaltman/Public/OpenAFS/1.4.1/
> /afs/athena.mit.edu/user/j/a/jaltman/Public/OpenAFS/1.4.1/
> \\afs\athena.mit.edu\user\j\a\jaltman\Public\OpenAFS\1.4.1\
> 
> Please test this build and report back your experiences.  If things
> look good, 1.4.2 will be released shortly.
> 
> Jeffrey Altman

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