From: Rusty Russell <rusty@rustcorp.com.au>
Date: Tue, 29 Jul 2008 14:58:37 +0000 (-0500)
Subject: lguest: Enlarge virtio rings
X-Git-Tag: v2.6.27-rc1~1^2~1
X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=0f0c4fab8284f3b886b2e1e0e317e3bb8de176b3;p=linux-2.6

lguest: Enlarge virtio rings

With big packets, 128 entries is a little small.

Guest -> Host 1GB TCP:
Before: 8.43625 seconds xmit 95640 recv 198266 timeout 49771 usec 1252
After: 8.01099 seconds xmit 49200 recv 102263 timeout 26014 usec 2118

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
---

diff --git a/Documentation/lguest/lguest.c b/Documentation/lguest/lguest.c
index dc49f50e04..f9bba2d8fe 100644
--- a/Documentation/lguest/lguest.c
+++ b/Documentation/lguest/lguest.c
@@ -66,8 +66,8 @@ typedef uint8_t u8;
 #endif
 /* We can have up to 256 pages for devices. */
 #define DEVICE_PAGES 256
-/* This will occupy 2 pages: it must be a power of 2. */
-#define VIRTQUEUE_NUM 128
+/* This will occupy 3 pages: it must be a power of 2. */
+#define VIRTQUEUE_NUM 256
 
 /*L:120 verbose is both a global flag and a macro.  The C preprocessor allows
  * this, and although I wouldn't recommend it, it works quite nicely here. */