[Qemu-devel] [PATCH] slirp: Signal free input buffer space to io-thread

[Jan Kiszka <jan.kiszka@siemens.com>]

This massively accelerates slirp reception speed: If data arrives
faster than the guest can read it from the input buffer, the file
descriptor for the corresponding socket was taken out of the fdset for
select. However, the event of the guest reading enough data from the
buffer was not signaled. Thus, the io-thread only noticed this change
on the next time-driven poll. Fix this by kicking the io-thread as
required.

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
---

Hell, this was really annoying when working with slirp, specifically
with KVM irqchip enabled (as it reduces userspace exits). But I never
really found the time to dig deep enough. And now it turned out to be
so simple! http://thread.gmane.org/gmane.comp.emulators.qemu/141975 was
the key for me.

 slirp/sbuf.c |    6 ++++++
 1 files changed, 6 insertions(+), 0 deletions(-)

diff --git a/slirp/sbuf.c b/slirp/sbuf.c
index 5a1ccbf..637f8fe 100644
--- a/slirp/sbuf.c
+++ b/slirp/sbuf.c
@@ -6,6 +6,7 @@
  */
 
 #include <slirp.h>
+#include <main-loop.h>
 
 static void sbappendsb(struct sbuf *sb, struct mbuf *m);
 
@@ -18,6 +19,8 @@ sbfree(struct sbuf *sb)
 void
 sbdrop(struct sbuf *sb, int num)
 {
+    int limit = sb->sb_datalen / 2;
+
 	/*
 	 * We can only drop how much we have
 	 * This should never succeed
@@ -29,6 +32,9 @@ sbdrop(struct sbuf *sb, int num)
 	if(sb->sb_rptr >= sb->sb_data + sb->sb_datalen)
 		sb->sb_rptr -= sb->sb_datalen;
 
+    if (sb->sb_cc < limit && sb->sb_cc + num >= limit) {
+        qemu_notify_event();
+    }
 }
 
 void
-- 
1.7.3.4