WARNING - OLD ARCHIVES

This is an archived copy of the Xen.org mailing list, which we have preserved to ensure that existing links to archives are not broken. The live archive, which contains the latest emails, can be found at http://lists.xen.org/
   
 
 
Xen 
 
Home Products Support Community News
 
   
 

xen-users

Re: [Xen-users] GPLPV driver Send performance

To: "Fajar A. Nugraha" <fajar@xxxxxxxxx>
Subject: Re: [Xen-users] GPLPV driver Send performance
From: Klaus Steinberger <Klaus.Steinberger@xxxxxxxxxxxxxxxxxxxxxx>
Date: Fri, 04 Dec 2009 11:26:28 +0100
Cc: xen-users@xxxxxxxxxxxxxxxxxxx
Delivery-date: Fri, 04 Dec 2009 02:27:12 -0800
Envelope-to: www-data@xxxxxxxxxxxxxxxxxxx
In-reply-to: <7207d96f0912040127h69b8ae97g705c857eaabd702d@xxxxxxxxxxxxxx>
List-help: <mailto:xen-users-request@lists.xensource.com?subject=help>
List-id: Xen user discussion <xen-users.lists.xensource.com>
List-post: <mailto:xen-users@lists.xensource.com>
List-subscribe: <http://lists.xensource.com/mailman/listinfo/xen-users>, <mailto:xen-users-request@lists.xensource.com?subject=subscribe>
List-unsubscribe: <http://lists.xensource.com/mailman/listinfo/xen-users>, <mailto:xen-users-request@lists.xensource.com?subject=unsubscribe>
References: <4B18D16C.7080403@xxxxxxxxxxxxxxxxxxxxxx> <7207d96f0912040127h69b8ae97g705c857eaabd702d@xxxxxxxxxxxxxx>
Sender: xen-users-bounces@xxxxxxxxxxxxxxxxxxx
User-agent: Internet Messaging Program (IMP) H3 (4.3.5)
Quoting "Fajar A. Nugraha" <fajar@xxxxxxxxx>:

On Fri, Dec 4, 2009 at 4:07 PM, Klaus Steinberger
<klaus.steinberger@xxxxxxxxxxxxxxxxxxxxxx> wrote:
Hi,

in a Windows 2003 64bit VM I have the following problem with the GPLPV driver
(newest version 0.10.0.138 ):


Receiving is very fast, but sending is ugly slow. The host system is Scientific
Linux 5.4. Any Idea what I can do?

Have you tried changing TCP offload settings on Windows side?

Ah, that's the solution. I switched off now Large Send Offload. Probably the somewhat old XEN which is used by RHEL doesn't do the right things with it. Only bad point: Switching it off killed the network connection and only a reboot off the windows guest solved that. Now I have the following numbers:

[root@gar-ha-xen01 ~]# iperf -s
------------------------------------------------------------
Server listening on TCP port 5001
TCP window size: 85.3 KByte (default)
------------------------------------------------------------
[  4] local 192.168.160.130 port 5001 connected with 192.168.160.72 port 1278
[ ID] Interval       Transfer     Bandwidth
[  4]  0.0-10.0 sec    281 MBytes    236 Mbits/sec
[root@gar-ha-xen01 ~]# iperf -c tsm
------------------------------------------------------------
Client connecting to tsm, TCP port 5001
TCP window size: 16.0 KByte (default)
------------------------------------------------------------
[  3] local 192.168.160.130 port 35137 connected with 192.168.160.72 port 5001
[ ID] Interval       Transfer     Bandwidth
[  3]  0.0-10.0 sec    831 MBytes    697 Mbits/sec
[root@gar-ha-xen01 ~]#

Sincerly,
Klaus


--
Klaus Steinberger         Beschleunigerlaboratorium
Phone: (+49 89)289 14287  Am Coulombwall 6, D-85748 Garching, Germany
FAX:   (+49 89)289 14280  EMail: Klaus.Steinberger@xxxxxxxxxxxxxxxxxxxxxx
URL: http://www.physik.uni-muenchen.de/~Klaus.Steinberger/


----------------------------------------------------------------
This message was sent using IMP, the Internet Messaging Program.

Attachment: binJRXSfPsmyB.bin
Description: PGP Public Key

_______________________________________________
Xen-users mailing list
Xen-users@xxxxxxxxxxxxxxxxxxx
http://lists.xensource.com/xen-users