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Message-ID: <CADVnQyknYYaduh4nnc27=oGofBqpExJzqA-ToXufZxbtm0xs6Q@mail.gmail.com> Date: Thu, 16 Feb 2012 13:19:58 -0500 From: Neal Cardwell <ncardwell@...gle.com> To: alekcejk@...glemail.com Cc: netdev@...r.kernel.org Subject: Re: Re: limited network bandwidth with 3.2.x kernels On Thu, Feb 16, 2012 at 12:54 PM, <alekcejk@...glemail.com> wrote: > Looks like "ethtool -k eth0" shows the same with both kernels: > > Offload parameters for eth0: > rx-checksumming: on > tx-checksumming: on > scatter-gather: on > tcp-segmentation-offload: off > udp-fragmentation-offload: off > generic-segmentation-offload: on > generic-receive-offload: on > large-receive-offload: off > rx-vlan-offload: off > tx-vlan-offload: off > ntuple-filters: off > receive-hashing: off Great. Thanks, Alexey. I still think it would be useful to have these three pieces of data for a slow/3.2.x transfer (from a geographically distant server) if you have a sec: - tcpdump of first 300 or so packets to see SYN/SYNACK options and RTT - tcpdump of _last_ 300 or so packets, to see the steady-state dynamics with receiver window and packet inter-arrival times - summary of overall throughput wget sees on that transfer This should help establish whether the receiver window is really the limiting factor in the slow cases. neal -- 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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