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.
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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