ggate and mmap, possible problem?

[Pawel Jakub Dawidek]

On Mon, Apr 11, 2005 at 04:49:16AM +0200, Daniel Eriksson wrote:
+> 
+> Hi! Is it possible that there is some sort of problem using mmap on a (UFS2)
+> filesystem mounted over ggate?
+> 
+> I keep getting errors on the console when I enable mmap on a server running
+> a proprietary video server application (which is a binary compiled on FBSD
+> 4.11 afaik). I don't have access to the source code for the server app
+> unfortunately (but I do have some access to the developers). I'm pretty sure
+> that with mmap enabled in the server, it tries to mmap all files smaller
+> than 50MB (most are 20-50MB).
+> 
+> The errors look like this:
+> 
+> g_vfs_done():ggate0[READ(offset=-1009882480640, length=65536)]error = 5
+> vnode_pager_getpages: I/O read error
+> vm_fault: pager read error, pid 1527 (mcvidserv)
+> 
+> 
+> This could certainly be a problem in the proprietary server, but I thought
+> I'd ask here too. This is on a recent 6-CURRENT system.

I don't think it is related to mmap(2), it may be caused by timeouts.
Can you increase debug level to 1 (kern.geom.gate.debug=1) and see if
it prints anything new on console?

-- 
Pawel Jakub Dawidek                       http://www.wheel.pl
pjd at FreeBSD.org                           http://www.FreeBSD.org
FreeBSD committer                         Am I Evil? Yes, I Am!
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