Hi to all,
we try to fill up our bandwith on a 32Mbps ATM link with a RTT 180ms. For this
we try to increase the TCP window size with web100 patch for linux. But we
are not able to get more than 3.3Mbps (without ATM overhead ~2.8Mbps) over
the link.
We took out for our test the firewall and there are no routers between both
servers. We use only the IP/ATM and one CISCO switch.
We are using for this on each side a Pentium 4 Xeon server with 4GB mem, and a
100MB ethernet card. SuSE SLES 8 but with the Linux kernel 2.3.28 with the
lates Web100 patch.
The settings in the proc filesystem:
/etc/sysctl.conf:
net.ipv4.ip_no_pmtu_disc = 0
net.core.netdev_max_backlog = 10000
net.core.rmem_default = 65536
net.core.wmem_default = 65536
net.core.rmem_max = 33554421
net.core.wmem_max = 33554432
net.ipv4.route.flush = 1
net.ipv4.tcp_rmem = 4096 87380 33554432
net.ipv4.tcp_wmem = 4096 65536 33554432
net.ipv4.tcp_mem = 33554432 33554432 33554432
net.ipv4.tcp_sack = 1
net.ipv4.tcp_fack = 1
net.ipv4.tcp_dsack = 1
net.ipv4.tcp_window_scaling = 1
net.ipv4.tcp_adv_win_scale = 2
net.ipv4.tcp_app_win = 31
net.ipv4.tcp_timestamps = 1
net.ipv4.web100_scalable_tcp = 1
net.ipv4.tcp_moderate_rcvbuf = 1
net.ipv4.tcp_default_win_scale = 7
net.ipv4.tcp_no_metrics_save = 1
net.ipv4.WAD_FloydAIMD = 1
net.ipv4.WAD_MaxBurst = 3
net.ipv4.WAD_IFQ = 1
net.ipv4.tcp_bic = 1
net.ipv4.tcp_bic_low_window = 14
net.ipv4.tcp_bic_fast_convergence = 1
net.ipv4.tcp_vegas_gamma = 200
net.ipv4.tcp_vegas_beta = 250
net.ipv4.tcp_vegas_alpha = 200
net.ipv4.tcp_vegas_cong_avoid = 1
net.ipv4.tcp_keepalive_intvl = 2
net.ipv4.tcp_keepalive_probes = 9
net.ipv4.tcp_keepalive_time = 5
net.ipv4.tcp_rfc1337 = 0
Is there maybe something missing in our configuration or we are still doing
something wrong?
Hope anyone can help!!!!!!!!!!!
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