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Re: [libvirt] problem with outbound limiting



On 08/10/2011 09:04 AM, Stefan Berger wrote:
On 08/10/2011 02:55 AM, Upendra Moturi wrote:

Hi,

does this patch solve your problem? I am setting the MTU to fixed 2kb.
Doing tests with scp seems to indicate that this improved the situation
-- at least for me.

Stefan

Signed-off-by: Stefan Berger <stefanb linux vnet ibm com>

---
src/util/network.c | 16 ++++++++--------
1 file changed, 8 insertions(+), 8 deletions(-)

Index: libvirt-acl/src/util/network.c
===================================================================
--- libvirt-acl.orig/src/util/network.c
+++ libvirt-acl/src/util/network.c
@@ -1156,8 +1156,8 @@ virBandwidthEnable(virBandwidthPtr bandw

virCommandFree(cmd);
cmd = virCommandNew(TC);
- virCommandAddArgList(cmd,"class", "add", "dev", iface, "parent",
- "1:", "classid", "1:1", "htb", NULL);
+ virCommandAddArgList(cmd,"class", "add", "dev", iface, "parent",
+ "1:", "classid", "1:1", "htb", NULL);
virCommandAddArgList(cmd, "rate", average, NULL);

This hunk was just indentation; you should push the whitespace changes as a separate commit (and can push that now, under the trivial rule, without needing further review). [It doesn't help matters that thunderbird botched the whitespace in my reply]

@@ -1202,7 +1202,7 @@ virBandwidthEnable(virBandwidthPtr bandw
virCommandAddArgList(cmd, "filter", "add", "dev", iface, "parent",
"ffff:", "protocol", "ip", "u32", "match", "ip",
"src", "0.0.0.0/0", "police", "rate", average,
- "burst", burst, "mtu", burst, "drop", "flowid",
+ "burst", burst, "mtu", "2kb", "drop", "flowid",
":1", NULL);

Here's the meat of the proposed patch. Is 2kb always valid, or will we run into problems on NICs that insist on traditional limits near the 1518 mark? Should it be user-configurable? I'm reluctant to ACK this without a bit more understanding of why 2kb works, as well as feedback on test results with the patch in place.

--
Eric Blake   eblake redhat com    +1-801-349-2682
Libvirt virtualization library http://libvirt.org


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