maybe try to play with net.ipv4.tcp_congestion_control ?
The available algorithms are:
• BIC - The default on Gentoo
• Reno - The classic TCP protocol. Most OSes use this.
• highspeed - HighSpeed TCP: Sally Floyd's suggested algorithm
• htcp - Hamilton TCP
• hybla - For Satellite Links
• scalable - Scalable TCP
• vegas - Vegas TCP
• westwood - Optimized for lossy networks
http://lwn.net/Articles/128681/
The High-speed TCP algorithm is optimized for very fat pipes - 10G Ethernet and such. When things are congested, it behaves much like the Reno algorithm. When the congestion window is being increased, however, the high-speed algorithm makes use of a table to pick large increment values. This approach lets the congestion window get very large (i.e. tens of thousands of segments) quickly, and to stay large, without requiring that the network function for long periods of time without a single dropped packet.
----- Mail original -----
De: "Stefan Priebe - Profihost AG" <s.priebe@xxxxxxxxxxxx>
À: ceph-devel@xxxxxxxxxxxxxxx
Envoyé: Lundi 18 Juin 2012 09:40:47
Objet: stable 10GBE under 3.4.2 or 3.5.0-rc2
Hi list,
i've still problems with stable network speed under recent kernels. With
3.0.32 i get stable 9.90 Gbit/s in both directions. With 3.4.2 or
3.5.0-rc2 it drops sometimes down to around 1 Gbit/s. Sadly i've no idea
when this happen? It works sometimes for minutes at 9.9Gbit/s and then
suddently only with 3-4Gbit/s or even 1Gbit/s using recent kernels.
I'm using various tunings recommanded by intel (Improving Performance)
=> http://downloadmirror.intel.com/5874/eng/README.txt
Has anybody a hint for me or additional settings intel does not mention?
Stefan
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