Re: [Qemu-devel] Network Performance between Win Host and Linux Guest

Re: [Qemu-devel] Network Performance between Win Host and Linux Guest

[Míguel]

It seems this interesting patch:

http://lists.gnu.org/archive/html/qemu-devel/2006-03/msg00041.html

hasn't been applied to CVS for some reason.

Has it been accidentally skipped or is it not applicable to CVS?

Best regards.
------------------------
Miguel.

[Qemu-devel] Network Performance between Win Host and Linux Guest

[vdr]

Hello,
I just upgraded to qemu 0.8.0 including vlan/tap patch and I noticed that the network speed is much slower than under 0.7.2 with tap patch ( 300KB/s vs 1MB/s ).
Any hints what I can do to sped this up ?
Helmut

Re: [Qemu-devel] Network Performance between Win Host and Linux Guest

[Helmut Auer]

vdr@helmutauer.de schrieb:
> Hello,
> I just upgraded to qemu 0.8.0 including vlan/tap patch and I noticed that the network speed is much slower than under 0.7.2 with tap patch ( 300KB/s vs 1MB/s ).
> Any hints what I can do to sped this up ?
> Helmut
>   
No ideas what can cause this ? I just checked it again with the tapped 
win binaries from the dion page. Net performance is about 15 times 
faster under 0.7.2

-- 
Helmut Auer, helmut@helmutauer.de 

Re: [Qemu-devel] Network Performance between Win Host and Linux Guest

[Kazu]

[-- Attachment #1: Type: text/plain, Size: 556 bytes --]

Tuesday, March 07, 2006 6:44 AM Helmut Auer wrote:


> vdr@helmutauer.de schrieb:
>> Hello,
>> I just upgraded to qemu 0.8.0 including vlan/tap patch and I noticed that
the network speed is much slower than under 0.7.2 with tap patch ( 300KB/s
vs 1MB/s ).
>> Any hints what I can do to sped this up ?
>> Helmut
>>
> No ideas what can cause this ? I just checked it again with the tapped
> win binaries from the dion page. Net performance is about 15 times
> faster under 0.7.2
>

Attached patch improves the performance against current CVS.

Regards,
Kazu

[-- Attachment #2: qemu-20060307-tap.patch --]
[-- Type: application/octet-stream, Size: 2149 bytes --]

Index: tap-win32.c
===================================================================
RCS file: /sources/qemu/qemu/tap-win32.c,v
retrieving revision 1.2
diff -u -r1.2 tap-win32.c
--- tap-win32.c	19 Feb 2006 12:40:00 -0000	1.2
+++ tap-win32.c	7 Mar 2006 04:18:44 -0000
@@ -642,7 +642,7 @@
 }
 
 /* XXX: horrible, suppress this by using proper thread signaling */
-void tap_win32_poll(void)
+int tap_win32_poll(void)
 {
     TAPState *s = tap_win32_state;
     uint8_t *buf;
@@ -650,13 +650,14 @@
     int size;
 
     if (!s)
-        return;
+        return -1;
 
     size = tap_win32_read(s->handle, &buf, max_size);
     if (size > 0) {
         qemu_send_packet(s->vc, buf, size);
         tap_win32_free_buffer(s->handle, buf);
     }
+    return size;
 }
 
 int tap_win32_init(VLANState *vlan, const char *ifname)
Index: vl.c
===================================================================
RCS file: /sources/qemu/qemu/vl.c,v
retrieving revision 1.165
diff -u -r1.165 vl.c
--- vl.c	20 Feb 2006 00:33:36 -0000	1.165
+++ vl.c	7 Mar 2006 04:18:49 -0000
@@ -3960,8 +3960,11 @@
 #ifdef _WIN32
     /* XXX: see how to merge it with the select. The constraint is
        that the select must be interrupted by the timer */
-    if (timeout > 0)
-        Sleep(timeout);
+    ret = tap_win32_poll();
+    if (ret <= 0) {
+        if (timeout > 0)
+            Sleep(timeout);
+    }
 #endif
     /* poll any events */
     /* XXX: separate device handlers from system ones */
@@ -4002,9 +4005,6 @@
             }
         }
     }
-#ifdef _WIN32
-    tap_win32_poll();
-#endif
 
 #if defined(CONFIG_SLIRP)
     /* XXX: merge with the previous select() */
Index: vl.h
===================================================================
RCS file: /sources/qemu/qemu/vl.h,v
retrieving revision 1.105
diff -u -r1.105 vl.h
--- vl.h	20 Feb 2006 00:33:36 -0000	1.105
+++ vl.h	7 Mar 2006 04:18:50 -0000
@@ -307,7 +307,7 @@
 
 /* TAP win32 */
 int tap_win32_init(VLANState *vlan, const char *ifname);
-void tap_win32_poll(void);
+int tap_win32_poll(void);
 
 /* NIC info */
 

Re: [Qemu-devel] Network Performance between Win Host and Linux Guest

[Lars Bakker]

Hello!

Did you find out why qemu's networking is so slow?
Is that a general issue or is it just happening when running qemu on
windows?
What has actually been changed in version 0.7.2? (The changelog says
that improvements were made in user-mode-networking)

> I guess the best way is to understand why the network is so slow. 
 > This is a bug in SLIRP ou the NE2000 emulated card, not > > something
 > due to the CPU emulation itself.

I saw some patches that add support for other NICs in qemu. Did anyone
experience an improvement in network performance when using these patches?

Sorry for asking so many questions, but I would really like to use qemu.
Network performance is quite important to me and I don't like the idea 
of using another hard disk image to access data from the host system,
because you cannot use it while qemu is running.

If someone gave me a hint on where to look to solve this problem, I
would be very grateful and I would certainly try to help.

Regards,
Lars

[Qemu-devel] Network Performance between Win Host and Linux Guest

[vdr]

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Hi,
QEMU is working better from hour to hour :-)
Now I am looking for a way to get my data from the linux client to the Win2K host. When I use the integrated smb I get a transfer rate from about 15 KB :-(
the tftp is about 600 KBps and using WinSCP over the "redired" ssh connection lead to 60 KBps. Is there a way to transfer the data faster ?
Or is there an explorer for the disk image available ?
Thanks in advance
Helmut

Re: [Qemu-devel] Network Performance between Win Host and Linux Guest

[Jonas Maebe]

On 26 aug 2005, at 15:57, vdr@helmutauer.de wrote:

> QEMU is working better from hour to hour :-)
> Now I am looking for a way to get my data from the linux client to  
> the Win2K host. When I use the integrated smb I get a transfer rate  
> from about 15 KB :-(
> the tftp is about 600 KBps and using WinSCP over the "redired" ssh  
> connection lead to 60 KBps. Is there a way to transfer the data  
> faster ?
> Or is there an explorer for the disk image available ?

At least under Mac OS X, you can simply mount the images created with  
qemu-img, if they contain a file system that Mac OS X knows. I guess  
under Linux you can also simply mount them. I can't imagine there  
aren't programs available for Windows which allow you to mount raw  
disk images containing a supported file system.


Jonas

Re: [Qemu-devel] Network Performance between Win Host and Linux Guest

[Filip Navara]

Jonas Maebe wrote:

>
> On 26 aug 2005, at 15:57, vdr@helmutauer.de wrote:
>
>> QEMU is working better from hour to hour :-)
>> Now I am looking for a way to get my data from the linux client to  
>> the Win2K host. When I use the integrated smb I get a transfer rate  
>> from about 15 KB :-(
>> the tftp is about 600 KBps and using WinSCP over the "redired" ssh  
>> connection lead to 60 KBps. Is there a way to transfer the data  
>> faster ?
>> Or is there an explorer for the disk image available ?
>
>
> At least under Mac OS X, you can simply mount the images created with  
> qemu-img, if they contain a file system that Mac OS X knows. I guess  
> under Linux you can also simply mount them. I can't imagine there  
> aren't programs available for Windows which allow you to mount raw  
> disk images containing a supported file system.

I can recommend VDK (http://chitchat.at.infoseek.co.jp/vmware/vdk.html). 
It can open VMDK and RAW images (both supported by QEMU)...

- Filip

Re: [Qemu-devel] Network Performance between Win Host and Linux Guest

[Christian MICHON]

winimage.
There's also the possibility to mount the img as a volume.
But there's a catch: both qemu and winimage want the
exclusivity of the image file. :(

On 8/26/05, vdr@helmutauer.de <vdr@helmutauer.de> wrote:
> Hi,
> QEMU is working better from hour to hour :-)
> Now I am looking for a way to get my data from the linux client to the Win2K host. When I use the integrated smb I get a transfer rate from about 15 KB :-(
> the tftp is about 600 KBps and using WinSCP over the "redired" ssh connection lead to 60 KBps. Is there a way to transfer the data faster ?
> Or is there an explorer for the disk image available ?
> Thanks in advance
> Helmut
> 
> 
> 
> _______________________________________________
> Qemu-devel mailing list
> Qemu-devel@nongnu.org
> http://lists.nongnu.org/mailman/listinfo/qemu-devel
> 
> 
> 


-- 
Christian

Re: [Qemu-devel] Network Performance between Win Host and Linux Guest

[Helmut Auer]

Hi Christian,

>winimage.
>There's also the possibility to mount the img as a volume.
>But there's a catch: both qemu and winimage want the
>exclusivity of the image file. :(
>
>  
>
I already tried WinImage ( V6 and v7 ). Both are telling me: Unable to 
open ...
Which foramt should I use for the disk ? Til now I am using the default 
raw image.

Bye
Helmut

Re: [Qemu-devel] Network Performance between Win Host and Linux Guest

[Christian MICHON]

you can only open dos/fat32 partitions on raw images.
I usually keep one partition dos available for my linux guests,
so I can easily exchange data offline using this dos partition.


On 8/26/05, Helmut Auer <vdr@helmutauer.de> wrote:
> Hi Christian,
> 
> >winimage.
> >There's also the possibility to mount the img as a volume.
> >But there's a catch: both qemu and winimage want the
> >exclusivity of the image file. :(
> >
> >
> >
> I already tried WinImage ( V6 and v7 ). Both are telling me: Unable to
> open ...
> Which foramt should I use for the disk ? Til now I am using the default
> raw image.
> 
> Bye
> Helmut
> 
> 
> _______________________________________________
> Qemu-devel mailing list
> Qemu-devel@nongnu.org
> http://lists.nongnu.org/mailman/listinfo/qemu-devel
> 


-- 
Christian

Re: [Qemu-devel] Network Performance between Win Host and Linux Guest

[Fabrice Bellard]

vdr@helmutauer.de wrote:
> Hi, QEMU is working better from hour to hour :-) Now I am looking for
> a way to get my data from the linux client to the Win2K host. When I
> use the integrated smb I get a transfer rate from about 15 KB :-( the
> tftp is about 600 KBps and using WinSCP over the "redired" ssh
> connection lead to 60 KBps. Is there a way to transfer the data
> faster ? Or is there an explorer for the disk image available ? 
> Thanks in advance Helmut

I guess the best way is to understand why the network is so slow. This 
is a bug in SLIRP ou the NE2000 emulated card, not something due to the 
CPU emulation itself.

Fabrice.