From 614f29bf3698591afb2c1920ac58af579c856685 Mon Sep 17 00:00:00 2001
From: JoelKatz <DavidJoelSchwartz@GMail.com>
Date: Thu, 9 May 2013 12:28:43 -0700
Subject: [PATCH] Too many threads can cause an I/O bottleneck.

---
 src/cpp/ripple/JobQueue.cpp | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/cpp/ripple/JobQueue.cpp b/src/cpp/ripple/JobQueue.cpp
index f6ce0bcf47..5429ba20c4 100644
--- a/src/cpp/ripple/JobQueue.cpp
+++ b/src/cpp/ripple/JobQueue.cpp
@@ -239,6 +239,8 @@ void JobQueue::setThreadCount(int c)
 		c = boost::thread::hardware_concurrency();
 		if (c < 0)
 			c = 2;
+		if (c > 4) // I/O will bottleneck
+			c = 4;
 		c += 2;
 		cLog(lsINFO) << "Auto-tuning to " << c << " validation/transaction/proposal threads";
 	}