On Wed, Jul 15, 2015 at 12:16:30AM +0200, Wolfgang Walter wrote: > Hello, > > I upgraded routers from 3.14.x to 4.1.2. Forwarding ISATAP-packets (IPv4 > packets with IPv6 payload) is very slow with 4.1 if GRO is enabled (youtube > for example about 64kbit). Disabling GRO on the interfaces restores > performance to values comparable to 3.14.x. > > The kernel is build with IPv6 support but IPv6 is disabled via kernel command > line. The router is not a tunnel endpoint, it only forwards the ISATAP- > packets. MTU is 1500 on both interfaces. Netfilter conntrack is not used and > disabling netfilter has no effect.
Can you run some tcpdumps and post the results in the two cases? Thanks, -- Email: Herbert Xu <herb...@gondor.apana.org.au> Home Page: http://gondor.apana.org.au/~herbert/ PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
