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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] Re: network performance drop heavily in xen 4.0 release
which .config you compare with? 2010/4/24 Ronaldo C. A. Chaves <xarqui@xxxxxxxxx>: > 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 >> > > _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel
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