> I compared the files and the difference is
>
> CONFIG_BLK_DEV_LOOP=m
> CONFIG_ATA_PIIX=m
> CONFIG_XEN_DEV_EVTCHN=y
>
> in config-2.6.31.13-high performance.
>
>
> 2010/4/24 yingbin wang <
yingbin.wangyb@xxxxxxxxx>
>>
>> of course.
>> the attachment is the dom0 kernel compile config that fix the problem.
>> I don't know the exact config option which cause the problem, so I
>> don't test 2.6.18.8 with debug.you can compare it with the previous
>> config to find the differences.
>>
>> Here are my test results:
>>
>> test tool: iperf-2.0.4
>> command:
>>
root@xxxxxxxxxxx : iperf -s
>>
root@xxxxxxxxxxx : iperf -c 10.250.6.25 -i 1 -t 100
>>
>> network performance:
>>
>> xen4.0+kernel2.6.31.13(with debug):
>> [ ID] Interval Transfer Bandwidth
>> [ 4] 0.0- 9.5 sec 249 MBytes 219 Mbits/sec
>>
>> xen4.0+kernel2.6.31.13(without debug):
>> [ ID] Interval Transfer Bandwidth
>> [ 4] 0.0-100.0 sec 10.7 GBytes 920 Mbits/sec
>>
>> xen3.4.2+kernel2.6.18.8(without debug):
>> [ ID] Interval Transfer Bandwidth
>> [ 4] 0.0-15.0 sec 1.64 GBytes 941 Mbits/sec
>>
>> xen4.0+kernel2.6.18.8(without debug):
>> [ ID] Interval Transfer Bandwidth
>> [ 4] 0.0-16.3 sec 1.79 GBytes 941 Mbits/sec
>>
>> Cheers,
>> wyb
>>
>> 2010/4/19 Pasi Kärkkäinen <
pasik@xxxxxx>:
>> > On Fri, Apr 16, 2010 at 04:49:42PM +0800, yingbin wang wrote:
>> >> the problem is solved.
>> >>
>> >> we closed most of the debug config options. a miracle happened. the
>> >> performance returned to the level before.
>> >> we compared the .config of 2.6.18.8 with 2.6.31.13. the differences
>> >> are the debug options.
>> >> I think the default .config in 2.6.31.13 should close the debug
>> >> options or provide a way to turn off.
>> >>
>> >
>> > Could you please post the exact .config options you turned off to fix
>> > the problem?
>> > I can add that info to the wiki page.
>> >
>> > Also can you please post the performance numbers with 2.6.18.8 and
>> > pvops dom0 with and without debug? This would be interesting to know.
>> >
>> > Thanks!
>> >
>> > -- Pasi
>> >
>> >> thanks all
>> >>
>> >> Cheers,
>> >> wyb
>> >>
>> >> 2010/4/16 yingbin wang <
yingbin.wangyb@xxxxxxxxx>:
>> >> > Hi:
>> >> > I report a Bug !!! We have just upgraded to
>> >> > xen4.0+kernel2.6.31.13 recently. however , fond that the network
>> >> > performance drop heavily in dom0 (nearly Reduced by 2/3 vs
>> >> > xen3.4.2+kernel2.6.18.8 ) .
>> >> >
>> >> > our env :
>> >> > hardware :
>> >> > Intel(R) Xeon(R) CPU E5520 @ 2.27GHz
>> >> > 01:00.0 Ethernet controller: Broadcom Corporation NetXtreme II
>> >> > BCM5709 Gigabit Ethernet (rev 20)
>> >> > 01:00.1 Ethernet controller: Broadcom Corporation NetXtreme II
>> >> > BCM5709 Gigabit Ethernet (rev 20)
>> >> > compile env and filesystem :
>> >> > Redhat AS 5.4
>> >> >
>> >> > xm info :
>> >> > -----------------------------------------------------------------
>> >> > host : r02k08015
>> >> > release : 2.6.31.13xen
>> >> > version : #1 SMP Tue Apr 13 20:38:51 CST 2010
>> >> > machine : x86_64
>> >> > nr_cpus : 16
>> >> > nr_nodes : 2
>> >> > cores_per_socket : 4
>> >> > threads_per_core : 2
>> >> > cpu_mhz : 2266
>> >> > hw_caps :
>> >> >
>> >> > bfebfbff:28100800:00000000:00001b40:009ce3bd:00000000:00000001:00000000
>> >> > virt_caps : hvm
>> >> > total_memory : 24539
>> >> > free_memory : 15596
>> >> > node_to_cpu : node0:0,2,4,6,8,10,12,14
>> >> > node1:1,3,5,7,9,11,13,15
>> >> > node_to_memory : node0:3589
>> >> > node1:12007
>> >> > node_to_dma32_mem : node0:2584
>> >> > node1:0
>> >> > max_node_id : 1
>> >> > xen_major : 4
>> >> > xen_minor : 0
>> >> > xen_extra : .0
>> >> > xen_caps : xen-3.0-x86_64 xen-3.0-x86_32p
>> >> > hvm-3.0-x86_32
>> >> > hvm-3.0-x86_32p hvm-3.0-x86_64
>> >> > xen_scheduler : credit
>> >> > xen_pagesize : 4096
>> >> > platform_params : virt_start=0xffff800000000000
>> >> > xen_changeset : unavailable
>> >> > xen_commandline : dom0_mem=10240M
>> >> > cc_compiler : gcc version 4.1.2 20080704 (Red Hat
>> >> > 4.1.2-46)
>> >> > cc_compile_by : root
>> >> > cc_compile_domain :
>> >> > cc_compile_date : Tue Apr 13 23:04:16 CST 2010
>> >> > xend_config_format : 4
>> >> >
>> >> > ---------------------------------------------------------------------------
>> >> >
>> >> >
>> >> > test tool: iperf-2.0.4
>> >> > command:
>> >> >
root@xxxxxxxxxxx : iperf -s
>> >> >
root@xxxxxxxxxxx : iperf -c 10.250.6.25 -i 1 -t 100
>> >> >
>> >> > network performance:
>> >> >
>> >> > xen4.0+kernel2.6.31.13:
>> >> > [ ID] Interval Transfer Bandwidth
>> >> > [ 4] 0.0- 9.5 sec 249 MBytes 219 Mbits/sec
>> >> >
>> >> > xen3.4.2+kernel2.6.18.8:
>> >> > [ ID] Interval Transfer Bandwidth
>> >> > [ 4] 0.0-15.0 sec 1.64 GBytes 941 Mbits/sec
>> >> >
>> >> > BTW ,1 the disk IO performance also reduce from 90MB/s to 60MB/s.
>> >> > 2 the attachment is the dom0 kernel compile config.
>> >> >
>> >> > Cheers,
>> >> > wyb
>> >> >
>> >>
>> >> _______________________________________________
>> >> Xen-devel mailing list
>> >>
Xen-devel@xxxxxxxxxxxxxxxxxxx
>> >>
http://lists.xensource.com/xen-devel
>> >
>>
>> _______________________________________________
>> Xen-devel mailing list
>>
Xen-devel@xxxxxxxxxxxxxxxxxxx
>>
http://lists.xensource.com/xen-devel
>>
>
>
