Re: 2.6.17 regression: Very slow net transfer from some hosts

Daniel Drake wrote:

Stephen Hemminger wrote:

Turn off TCP window scaling, your performance will be limited but about
as good as you can get with a corrupting firewall in between.

[snip]

For anyone else interested, the ISP is NTL (UK). The fix:

    echo "4096    16384   131072 " > /proc/sys/net/ipv4/tcp_wmem
    echo "4096    87380   174760 " > /proc/sys/net/ipv4/tcp_rmem

For the record, I think Stephen's suggested workaround is better:

echo 0 > /proc/sys/net/ipv4/tcp_window_scaling

It will prevent the other end of the connection from using a window scale, so it "fixes" both directions of the connection, not just receiving.

Thanks,
  -John
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• References:
  • 2.6.17 regression: Very slow net transfer from some hosts
    • From: Daniel Drake <[email protected]>
  • Re: 2.6.17 regression: Very slow net transfer from some hosts
    • From: John Heffner <[email protected]>
  • Re: 2.6.17 regression: Very slow net transfer from some hosts
    • From: Daniel Drake <[email protected]>
  • Re: 2.6.17 regression: Very slow net transfer from some hosts
    • From: John Heffner <[email protected]>
  • Re: 2.6.17 regression: Very slow net transfer from some hosts
    • From: Daniel Drake <[email protected]>
  • Re: 2.6.17 regression: Very slow net transfer from some hosts
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    • From: Daniel Drake <[email protected]>
  • Re: 2.6.17 regression: Very slow net transfer from some hosts
    • From: Stephen Hemminger <[email protected]>
  • Re: 2.6.17 regression: Very slow net transfer from some hosts
    • From: Daniel Drake <[email protected]>

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