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From: "George V. Neville-Neil" <gnn@FreeBSD.org>
Date: Thu, 11 Jun 2009 21:32:26 +0000 (UTC)
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Subject: svn commit: r194039 - head/sys/dev/cxgb
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Author: gnn
Date: Thu Jun 11 21:32:26 2009
New Revision: 194039
URL: http://svn.freebsd.org/changeset/base/194039

Log:
  Re-add the send queue tunable for people who do not use buffering.
  
  Reviewed by:	jhb
  MFC after:	3 days

Modified:
  head/sys/dev/cxgb/cxgb_main.c

Modified: head/sys/dev/cxgb/cxgb_main.c
==============================================================================
--- head/sys/dev/cxgb/cxgb_main.c	Thu Jun 11 19:07:15 2009	(r194038)
+++ head/sys/dev/cxgb/cxgb_main.c	Thu Jun 11 21:32:26 2009	(r194039)
@@ -224,6 +224,15 @@ TUNABLE_INT("hw.cxgb.use_16k_clusters", 
 SYSCTL_UINT(_hw_cxgb, OID_AUTO, use_16k_clusters, CTLFLAG_RDTUN,
     &cxgb_use_16k_clusters, 0, "use 16kB clusters for the jumbo queue ");
 
+/*
+ * Tune the size of the output queue.
+ */
+int cxgb_snd_queue_len = IFQ_MAXLEN;
+TUNABLE_INT("hw.cxgb.snd_queue_len", &cxgb_snd_queue_len);
+SYSCTL_UINT(_hw_cxgb, OID_AUTO, snd_queue_len, CTLFLAG_RDTUN,
+    &cxgb_snd_queue_len, 0, "send queue size ");
+
+
 enum {
 	MAX_TXQ_ENTRIES      = 16384,
 	MAX_CTRL_TXQ_ENTRIES = 1024,
@@ -1025,7 +1034,7 @@ cxgb_port_attach(device_t dev)
 	ifp->if_timer = 0;	/* Disable ifnet watchdog */
 	ifp->if_watchdog = NULL;
 
-	ifp->if_snd.ifq_drv_maxlen = IFQ_MAXLEN;
+	ifp->if_snd.ifq_drv_maxlen = cxgb_snd_queue_len;
 	IFQ_SET_MAXLEN(&ifp->if_snd, ifp->if_snd.ifq_drv_maxlen);
 	IFQ_SET_READY(&ifp->if_snd);