[DRBD-user] RE: DRDB+ scaling in the 10Gbit ballpark

Kelly Byrd kbyrd-drbd at memcpy.com
Wed Sep 19 15:09:11 CEST 2007

Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.

> so we stayed with the regular 'bond0 miimon=100 mode=0'. We stil don't 
> know why using 3 or 4 nic's doesnt speedup the maximum throughput.
> If anyone knows please share. 

From: http://www.mjmwired.net/kernel/Documentation/networking/bonding.txt

| It is possible to adjust TCP/IP's congestion limits by 
| 1659 altering the net.ipv4.tcp_reordering sysctl parameter. The 
| 1660 usual default value is 3, and the maximum useful value is 127. 
| 1661 For a four interface balance-rr bond, expect that a single 
| 1662 TCP/IP stream will utilize no more than approximately 2.3 
| 1663 interface's worth of throughput, even after adjusting 
| 1664 tcp_reordering.

 Four should give you more that two I guess, but it's diminishing returns. 

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