Better support for dynamic option changes in llcorehttp. Libcurl has

some problems disabling pipelining on a multi handle with outstanding
requests so build a more conservative system that allows requests
to drain before setting curl multi options.  Would rather not have
this but it is significantly safer.  "HttpPipelining" debug setting
is now fully dynamic.  Connection limits can also be made dynamic
in the near future.  Upped the default connection count back to 8 for
now but will revisit this in the tuning phase.  It might be time to
combine mesh and textures into a single asset class.  For normal
server operations that would be a clear path, but for server under
load, the current scheme may be better.  Minor cleanup in logging
to elminate some redundant strings.  Might add some more tracing to the
stall logic 'just in case'.

1 files changed, 7 insertions, 3 deletions

diff --git a/indra/newview/lltexturefetch.h b/indra/newview/lltexturefetch.h
index d13736997f..89d18e2c67 100755
--- a/indra/newview/lltexturefetch.h
+++ b/indra/newview/lltexturefetch.h
@@ -356,8 +356,8 @@ private:
 	LLCore::HttpHeaders *				mHttpHeaders;					// Ttf
 	LLCore::HttpHeaders *				mHttpMetricsHeaders;			// Ttf
 	LLCore::HttpRequest::policy_t		mHttpPolicyClass;				// T*
-	S32									mHttpHighWater;					// T* (ro)
-	S32									mHttpLowWater;					// T* (ro)
+	S32									mHttpHighWater;					// Ttf
+	S32									mHttpLowWater;					// Ttf
 	
 	// We use a resource semaphore to keep HTTP requests in
 	// WAIT_HTTP_RESOURCE2 if there aren't sufficient slots in the
@@ -366,7 +366,11 @@ private:
 	// where it's more expensive to get at them.  Requests in either
 	// SEND_HTTP_REQ or WAIT_HTTP_REQ charge against the semaphore
 	// and tracking state transitions is critical to liveness.
-	LLAtomicS32							mHttpSemaphore;					// Ttf + Tmain
+	//
+	// Originally implemented as a traditional semaphore (heading towards
+	// zero), it now is an outstanding request count that is allowed to
+	// exceed the high water level (but not go below zero).
+	LLAtomicS32							mHttpSemaphore;					// Ttf
 	
 	typedef std::set<LLUUID> wait_http_res_queue_t;
 	wait_http_res_queue_t				mHttpWaitResource;				// Mfnq