It's not just Etherboot that fails to generate TX completions.

diff --git a/src/arch/i386/drivers/net/undinet.c b/src/arch/i386/drivers/net/undinet.c
index 0710659..dc4ef98 100644 (file)
--- a/src/arch/i386/drivers/net/undinet.c
+++ b/src/arch/i386/drivers/net/undinet.c
@@ -335,8 +335,8 @@ static int undinet_transmit ( struct net_device *netdev,
 
        /* Technically, we ought to make sure that the previous
         * transmission has completed before we re-use the buffer.
-        * However, this would break a gPXE-running-over-Etherboot
-        * setup, since Etherboot fails to generate TX completions.
+        * However, many PXE stacks (including at least some Intel PXE
+        * stacks and Etherboot 5.4) fail to generate TX completions.
         * In practice this won't be a problem, since our TX datapath
         * has a very low packet volume and we can get away with
         * assuming that a TX will be complete by the time we want to