[DRBD-user] DRBD over 10GE, limited throughput

Steve Thompson smt at vgersoft.com
Fri Apr 11 14:32:59 CEST 2014

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


On Fri, 11 Apr 2014, Ben RUBSON wrote:

> Did you do something specific to go up to 9.8 Gb/s ?

I am using these settings at present (in /etc/sysctl.conf):

net.core.rmem_default = 124928
net.core.wmem_default = 124928
net.core.rmem_max = 33554432
net.core.wmem_max = 33554432
net.core.optmem_max = 20480
net.core.netdev_max_backlog = 300000
net.ipv4.ipfrag_low_thresh = 196608
net.ipv4.ipfrag_high_thresh = 262144
net.ipv4.tcp_reordering = 3
net.ipv4.tcp_timestamps = 1
net.ipv4.tcp_sack = 1
net.ipv4.tcp_window_scaling = 1
net.ipv4.tcp_rmem = 4096 87380 33554432
net.ipv4.tcp_wmem = 4096 65536 33554432
net.ipv4.tcp_mem = 1528896 2038528 3057792
net.ipv4.tcp_max_syn_backlog = 16384
net.ipv4.tcp_no_metrics_save = 0
net.ipv4.tcp_congestion_control = cubic
net.ipv4.tcp_mtu_probing = 0
net.ipv4.tcp_slow_start_after_idle = 1

-Steve



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