On 08/27/11 18:46, Ben C. wrote:
> Hello,
>
> Yes indeed. I've verified on 8.2 and BETA1. Seemingly exact same
> issue. Running a NetBSD(-CURRENT) dom0. Happy to see progress but
> it's not quite there yet I guess.
>
> I've tried changing the model= line around and some other random,
> brute-force like tweaks but nothing seems to work. I can ping
> internal and external hosts, but just can't seem to carry on a regular
> TCP/IP conversation.
>
> I also found this :
> http://www.mail-archive.com/freebsd-xen@freebsd.org/msg00516.html
>
> Where someone running a Debian Lenny dom0 was experiencing almost the
> exact same issues I have.
>
> FreeBSD (or, any OS) has pretty poor performance running under full
> HVM .. PV drivers only work for i386 and I wouldn't be surprised if I
> experienced the same issues. (No time to test really..)
>
> Does anyone else have any input on this?
>
> Thanks, Ben C.
Hello Ben,
Someone (I don't recall who, cleared my INBOX and then read this mail..)
sent me a patch about 2 weeks ago which solved the issue for me.
If you [reader]'re the one who wrote the patch, once again my thanks,
you made it possible for me to complete the project I was working on.
I'm not sure if this has been committed in the mean time, so here's the
reminder to do so before 9.0-RELEASE, in case this one got lost!
Keep up the good work!
Regards,
Hugo
-- sys/dev/xen/netfront/netfront.c.orig 2011-08-09 17:48:50.188600897 +0400
+++ sys/dev/xen/netfront/netfront.c 2011-08-09 17:52:47.289424716 +0400
@@ -261,6 +261,7 @@
u_int irq;
u_int copying_receiver;
u_int carrier;
+ u_int sg_allowed;
/* Receive-ring batched refills. */
#define RX_MIN_TARGET 32
@@ -1494,7 +1495,7 @@
* deal with nfrags > MAX_TX_REQ_FRAGS, which is a quirk of
* the Linux network stack.
*/
- if (nfrags > MAX_TX_REQ_FRAGS) {
+ if (nfrags > (sc->sg_allowed? MAX_TX_REQ_FRAGS : 1)) {
m = m_defrag(m_head, M_DONTWAIT);
if (!m) {
/*
@@ -1879,6 +1880,39 @@
if_link_state_change(ifp, LINK_STATE_DOWN);
}
+static void
+xennet_set_features(device_t dev, struct netfront_info *np)
+{
+ struct ifnet *ifp;
+ int val;
+
+ device_printf(dev, "backend features:");
+
+ if (xs_scanf(XST_NIL, xenbus_get_otherend_path(np->xbdev),
+ "feature-sg", NULL, "%d", &val) < 0)
+ val = 0;
+
+ np->sg_allowed = val;
+
+ if (val)
+ printf(" feature-sg");
+
+ if (xs_scanf(XST_NIL, xenbus_get_otherend_path(np->xbdev),
+ "feature-gso-tcpv4", NULL, "%d", &val) < 0)
+ val = 0;
+
+ if (val == 0) {
+ ifp = np->xn_ifp;
+ ifp->if_capabilities &= ~(IFCAP_TSO4|IFCAP_LRO);
+ ifp->if_capenable &= ~(IFCAP_TSO4|IFCAP_LRO);
+ ifp->if_hwassist &= ~(CSUM_TSO);
+ xn_enable_lro = 0;
+ } else
+ printf(" feature-gso-tcp4");
+
+ printf("\n");
+}
+
/* START of Xenolinux helper functions adapted to FreeBSD */
int
network_connect(struct netfront_info *np)
@@ -1910,6 +1944,8 @@
if (error)
return (error);
+ xennet_set_features(np->xbdev, np);
+
/* Step 1: Reinitialise variables. */
netif_release_tx_bufs(np);
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