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Date: Mon, 02 Feb 2009 11:48:25 -0500 From: Kenny Chang <kchang@...enacr.com> To: netdev@...r.kernel.org Subject: Re: Multicast packet loss Neil Horman wrote: > On Fri, Jan 30, 2009 at 11:41:23PM +0100, Eric Dumazet wrote: > >> Kenny Chang a écrit : >> >>> Ah, sorry, here's the test program attached. >>> >>> We've tried 2.6.28.1, but no, we haven't tried the 2.6.28.2 or the >>> 2.6.29.-rcX. >>> >>> Right now, we are trying to step through the kernel versions until we >>> see where the performance drops significantly. We'll try 2.6.29-rc soon >>> and post the result. >>> >> 2.6.29-rc contains UDP receive improvements (lockless) >> >> Problem is multicast handling was not yet updated, but could be :) >> >> >> I was asking you "cat /proc/interrupts" because I believe you might >> have a problem NIC interrupts being handled by one CPU only (when having problems) >> >> > That would be expected (if irqbalance is running), and desireable, since > spreading high volume interrupts like NICS accross multiple cores (or more > specifically multiple L2 caches), is going increase your cache line miss rate > significantly and decrease rx throughput. > > Although you do have a point here, if the system isn't running irqbalance, and > the NICS irq affinity is spread accross multiple L2 caches, that would be a > point of improvement performance-wise. > > Kenny, if you could provide the /proc/interrupts info along with /proc/cpuinfo > and your stats that I asked about earlier, that would be a big help. > > Regards > Neil > > This is for a working setup. -Kenny kchang@...i:~$ uname -a Linux fiji 2.6.24-19-generic #1 SMP Wed Aug 20 17:53:40 UTC 2008 x86_64 GNU/Linux kchang@...i:~$ cat /proc/cpuinfo processor : 0 vendor_id : GenuineIntel cpu family : 6 model : 15 model name : Intel(R) Core(TM)2 Quad CPU Q6600 @ 2.40GHz stepping : 11 cpu MHz : 1600.000 cache size : 4096 KB physical id : 0 siblings : 4 core id : 0 cpu cores : 4 fpu : yes fpu_exception : yes cpuid level : 10 wp : yes flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx lm constant_tsc arch_perfmon pebs bts rep_good pni monitor ds_cpl vmx est tm2 ssse3 cx16 xtpr lahf_lm bogomips : 4791.31 clflush size : 64 cache_alignment : 64 address sizes : 36 bits physical, 48 bits virtual power management: processor : 1 vendor_id : GenuineIntel cpu family : 6 model : 15 model name : Intel(R) Core(TM)2 Quad CPU Q6600 @ 2.40GHz stepping : 11 cpu MHz : 1600.000 cache size : 4096 KB physical id : 0 siblings : 4 core id : 1 cpu cores : 4 fpu : yes fpu_exception : yes cpuid level : 10 wp : yes flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx lm constant_tsc arch_perfmon pebs bts rep_good pni monitor ds_cpl vmx est tm2 ssse3 cx16 xtpr lahf_lm bogomips : 4788.05 clflush size : 64 cache_alignment : 64 address sizes : 36 bits physical, 48 bits virtual power management: processor : 2 vendor_id : GenuineIntel cpu family : 6 model : 15 model name : Intel(R) Core(TM)2 Quad CPU Q6600 @ 2.40GHz stepping : 11 cpu MHz : 1600.000 cache size : 4096 KB physical id : 0 siblings : 4 core id : 2 cpu cores : 4 fpu : yes fpu_exception : yes cpuid level : 10 wp : yes flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx lm constant_tsc arch_perfmon pebs bts rep_good pni monitor ds_cpl vmx est tm2 ssse3 cx16 xtpr lahf_lm bogomips : 4788.08 clflush size : 64 cache_alignment : 64 address sizes : 36 bits physical, 48 bits virtual power management: processor : 3 vendor_id : GenuineIntel cpu family : 6 model : 15 model name : Intel(R) Core(TM)2 Quad CPU Q6600 @ 2.40GHz stepping : 11 cpu MHz : 1600.000 cache size : 4096 KB physical id : 0 siblings : 4 core id : 3 cpu cores : 4 fpu : yes fpu_exception : yes cpuid level : 10 wp : yes flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx lm constant_tsc arch_perfmon pebs bts rep_good pni monitor ds_cpl vmx est tm2 ssse3 cx16 xtpr lahf_lm bogomips : 4788.07 clflush size : 64 cache_alignment : 64 address sizes : 36 bits physical, 48 bits virtual power management: kchang@...i:~$ cat /proc/interrupts CPU0 CPU1 CPU2 CPU3 0: 165 0 0 0 IO-APIC-edge timer 1: 2 0 0 0 IO-APIC-edge i8042 8: 1 0 0 0 IO-APIC-edge rtc 9: 0 0 0 0 IO-APIC-fasteoi acpi 12: 4 0 0 0 IO-APIC-edge i8042 16: 25614400 0 0 0 IO-APIC-fasteoi uhci_hcd:usb3, HDA Intel, eth1, nvidia 17: 571932 0 0 0 IO-APIC-fasteoi uhci_hcd:usb4, uhci_hcd:usb6 18: 102824 0 0 0 IO-APIC-fasteoi uhci_hcd:usb7 22: 0 0 0 0 IO-APIC-fasteoi ehci_hcd:usb1 23: 1636819 0 0 0 IO-APIC-fasteoi ehci_hcd:usb2, uhci_hcd:usb5 507: 12542966 0 0 0 PCI-MSI-edge eth0 508: 1201118 0 0 0 PCI-MSI-edge ahci NMI: 0 0 0 0 Non-maskable interrupts LOC: 29214662 20141857 21777347 14279251 Local timer interrupts RES: 205758 173268 238058 123958 Rescheduling interrupts CAL: 2623 3732 3814 2747 function call interrupts TLB: 29961 56621 31440 55783 TLB shootdowns TRM: 0 0 0 0 Thermal event interrupts THR: 0 0 0 0 Threshold APIC interrupts SPU: 0 0 0 0 Spurious interrupts ERR: 0 -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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