[ovs-discuss] Question on ovs 1.11.0 megaflow

Gurucharan Shetty shettyg at nicira.com
Sun Oct 20 16:02:15 UTC 2013


On Fri, Oct 18, 2013 at 6:05 PM, Jian Qiu <swordqiu at gmail.com> wrote:
> Hi,
>
>
> Previously, we used ovs 1.4.x and found ovs-vswitchd dropping logs. Then we
> upgraded to ovs 1.11.0 as suggested on this mailing list. We did observe
> drop of the CPU utilization on host.
>
> However, we still randomly found ovs-vswitchd dropping logs. Some ovs logs
> are pasted below.
>
> I have two questions:
>
> 1) As megaflow was introduced in ovs 1.11.0, I'm wondering whether megaflow
> is transparent to userspace? i.e. is there any specific requirement on flow
> configuration so that we can fully utilize the power of megaflow?
>
> 2) As logs show, we persistently observed "failed to flow_del" messages in
> our ovs logs. I'm wondering what's the cause for this warning message?
>
> Looking forward to your kind help.
>
> Many thanks.
>
> Jian Qiu
>
> === ovs logs ====
>
> 2013-10-18T04:00:23Z|4395745|dpif|WARN|Dropped 1120 log messages in last 1
> seconds (most recently, 1 seconds ago) due to excessive rate
> 2013-10-18T04:00:23Z|4395746|dpif|WARN|system at ovs-system: failed to flow_del
> (No such file or directory)

I think you are not using the kernel module from 1.11 but rather an
old kernel module or the kernel module that comes through linux
kernel.

> skb_priority(0),in_port(10),skb_mark(0),eth(src=54:25:8a:6c:5b:9d,dst=00:22:16:3b:ec:0d),eth_type(0x0800),ipv4(src=10.64.13.218,dst=10.64.15.204,proto=6,tos=0,ttl=63,frag=no),tcp(src=4401,dst=49559)
> 2013-10-18T04:00:24Z|4395747|dpif|WARN|Dropped 1120 log messages in last 1
> seconds (most recently, 1 seconds ago) due to excessive rate
> 2013-10-18T04:00:24Z|4395748|dpif|WARN|system at ovs-system: failed to flow_del
> (No such file or directory)
> skb_priority(0),in_port(10),skb_mark(0),eth(src=54:25:8a:6c:5b:9d,dst=00:22:16:3b:ec:0d),eth_type(0x0800),ipv4(src=10.64.13.218,dst=10.64.15.204,proto=6,tos=0,ttl=63,frag=no),tcp(src=4401,dst=49559)
> 2013-10-18T04:00:25Z|4395749|dpif|WARN|Dropped 1120 log messages in last 1
> seconds (most recently, 1 seconds ago) due to excessive rate
> 2013-10-18T04:00:25Z|4395750|dpif|WARN|system at ovs-system:
> f2013-10-18T15:03:18Z|00001|vlog|INFO|opened log file
> /usr/local/var/log/openvswitch/ovs-vswitchd.log
>
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