> 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
>> >
>>
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>>
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>
