--- /n/sources/plan9/sys/src/9/pc/ether82563.c	Mon Mar 24 17:51:28 2014
+++ /sys/src/9/pc/ether82563.c	Sun Jan 10 00:00:00 2016
@@ -414,9 +414,13 @@
 };
 
 enum {
-	/* were 512, 1024 & 64, but 52, 253 and 9 are ample. */
+	/*
+	 * these were 512, 1024 & 64, but 52, 253 & 9 are usually ample;
+	 * however cpu servers and terminals can need more receive buffers
+	 * due to bursts of traffic.
+	 */
 	Nrd		= 128,		/* power of two */
-	Nrb		= 512,		/* private receive buffers per Ctlr */
+	Nrb		= 1024,		/* private receive buffers per Ctlr */
 	Ntd		= 32,		/* power of two */
 };
 
--- /n/sources/plan9/sys/src/9/pc/ether82598.c	Tue Mar 18 21:32:01 2014
+++ /sys/src/9/pc/ether82598.c	Sun Jan 10 00:00:00 2016
@@ -23,9 +23,13 @@
 
 	/* tunable parameters */
 	Goslow	= 0,		/* flag: go slow by throttling intrs, etc. */
-	/* were 256, 1024 & 64, but 30, 47 and 1 are ample. */
-	Nrd	= 64,		/* multiple of 8, power of 2 for NEXTPOW2 */
-	Nrb	= 128,
+	/*
+	 * these were 256, 1024 & 128, but 30, 47 and 1 are usually ample;
+	 * however cpu servers and terminals can need more receive buffers
+	 * due to bursts of traffic.
+	 */
+	Nrd	= 128,		/* multiple of 8, power of 2 for NEXTPOW2 */
+	Nrb	= 1024,
 	Ntd	= 32,		/* multiple of 8, power of 2 for NEXTPOW2 */
 };
 
--- /n/sources/plan9/sys/src/9/pc/etherigbe.c	Mon Mar 24 17:51:28 2014
+++ /sys/src/9/pc/etherigbe.c	Sun Jan 10 00:00:00 2016
@@ -444,9 +444,13 @@
 
 enum {
 	Rbsz		= 2048,
-	/* were 256, 1024 & 64, but 52, 253 and 9 are ample. */
+	/*
+	 * these were 256, 1024 & 64, but 52, 253 & 9 are usually ample;
+	 * however cpu servers and terminals can need more receive buffers
+	 * due to bursts of traffic.
+	 */
 	Nrd		= 128,		/* multiple of 8 */
-	Nrb		= 512,		/* private receive buffers per Ctlr */
+	Nrb		= 1024,		/* private receive buffers per Ctlr */
 	Ntd		= 32,		/* multiple of 8 */
 };