[Xen-users] Bad network performances

[Lorenzo Milesi <lorenzo.milesi@xxxxxxxxxx>]

Hi.

I've a Debian6 server, running kernel 2.6.32-5-xen-amd64, Xen hypervisor 
4.0.1-2.
It runs 2VM, an HVM firewall and a PV Ubuntu 10.04.

I'm experiencing terrible network performances on the main interface, shared on 
both VMs and used as br0 on the dom0. 
At first, I'm seeing the issue that network is stuck for some 20/30 seconds 
when the HVM machine boots. But that's not a big deal, since hopefully it won't 
boot often.

Now I'm having this trouble that causes the VM not to answer to network 
requests, i.e. samba locked, other web services not responding... After some 
time everything comes back to normal. 

The network card is an onboard Broadcom Corporation NetXtreme II BCM5716 
Gigabit Ethernet.

I see no error on syslog, dmesg, xend.log, xend-debug.log, and I don't know 
where else to search!
Any adivce on where to look at?
thanks


# brctl show
bridge name     bridge id               STP enabled     interfaces
br0             8000.9ef9b09dd270       no              eth0
                                                        tap-vif-1.0
                                                        vif-1.0
                                                        vif4.0
br1             8000.2edf8e9d2372       no              eth1
                                                        tap-vif-1.1
                                                        vif-1.1
br2             8000.001b218e9df1       no              eth2
                                                        tap-vif-1.2
                                                        vif-1.2
                                                        vif4.1
br3             8000.001b218e9df0       no              eth3
                                                        tap-vif-1.3
                                                        vif-1.3
                                                        vif4.2
br4             8000.001b2199ecdf       no              eth4


xend-config.sxp:
(xend-http-server yes)
(xend-unix-server yes)
(xend-relocation-server yes)
(xend-port            8000)
(xend-relocation-port 8002)
(vif-script 'vif-bridge name=br0')
(dom0-min-mem 196)
(enable-dom0-ballooning yes)
(total_available_memory 0) 
(dom0-cpus 0)
(vnc-listen '0.0.0.0')
(vncpasswd '')

PV config:
name = "fileserver"
uuid = "e5791118-e139-1f87-1aa1-98b010e3ba9b"
maxmem = 5120
memory = 5120
vcpus = 4
bootloader = "/usr/lib/xen-4.0/bin/pygrub"
on_poweroff = "destroy"
on_reboot = "restart"
on_crash = "restart"
vfb = [ "type=vnc,vncunused=1,keymap=it" ]
disk = [ "phy:/dev/drbd/by-res/fileserver,xvda,w" ]
vif = [ "mac=00:16:36:4a:81:f6,bridge=br0,script=vif-bridge", 
"mac=00:16:3e:48:93:eb,bridge=br2,script=vif-bridge", 
"mac=00:16:3e:6a:bd:cd,bridge=br3,script=vif-bridge" ]

HVM config:
name = "efw"
uuid = "729db6a8-72e5-5205-02b6-6da26dbe5723"
maxmem = 1024
memory = 1024
vcpus = 1
builder = "hvm"
kernel = "/usr/lib/xen-default/boot/hvmloader"
boot = "dc"
pae = 1
acpi = 1
apic = 0
hap = 0
localtime = 0
on_poweroff = "destroy"
on_reboot = "restart"
on_crash = "restart"
device_model = "/usr/lib64/xen/bin/qemu-dm"
vfb = [ "type=vnc,vncunused=1,keymap=it" ]
disk = [ "phy:/dev/drbd/by-res/firewall,hda,w" ]
vif = [ 
    "mac=00:16:36:49:81:97,bridge=br0,script=vif-bridge,vifname=vif-1.0",
    "mac=00:16:36:da:8a:09,bridge=br1,script=vif-bridge,vifname=vif-1.1",
    "mac=00:16:3e:6a:e0:be,bridge=br2,script=vif-bridge,vifname=vif-1.2",
    "mac=00:16:3e:6a:a3:72,bridge=br3,script=vif-bridge,vifname=vif-1.3"
    ]
parallel = "none"
serial = "none"


-- 
Lorenzo Milesi - lorenzo.milesi@xxxxxxxxxx

YetOpen S.r.l. - http://www.yetopen.it/
Via Carlo Torri Tarelli 19 - 23900 Lecco - ITALY -
Tel 0341 220 205 - Fax 178 6070 222

GPG/PGP Key-Id: 0xE704E230 - http://keyserver.linux.it

-------- D.Lgs. 196/2003 --------

Si avverte che tutte le informazioni contenute in questo messaggio sono
riservate ed a uso esclusivo del destinatario. Nel caso in cui questo
messaggio Le fosse pervenuto per errore, La invitiamo ad eliminarlo
senza copiarlo, a non inoltrarlo a terzi e ad avvertirci non appena
possibile.
Grazie.


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