Le 2010-01-13 09:49, Chris Buechler a écrit :
On Wed, Jan 13, 2010 at 12:59 AM, David Newman<[email protected]> wrote:
On 1/12/10 9:51 PM, Ugo Bellavance wrote:
On 2010-01-12 23:56, Chris Buechler wrote:
On Tue, Jan 12, 2010 at 11:50 PM, Ugo Bellavance<[email protected]> wrote:
Hi,
I'm running pfsense 1.2.2 on a pentium 4, 3.0 ghz, 1 GB RAM. HDD
install.
When I start a download from a nearby centos mirror, directly from the
firewall (using fetch), I get the full bandwith available from my ISP
(60
mbps). However, If I try to download the same file from the same
server,
but from a linux server behind the firewall, using wget, I only get
about 20
mbps. If I start multiple download, I can reach 60mbps. Is there an
explanation?
Probably a TCP window difference of some sort between FreeBSD and your
Linux box.
How would I check that?
Run tcpdump to capture traffic from both types of transfers (from the
firewall and behind the firewall). Then examine the captures to compare
the TCP receive window sizes during the transfers.
That's the best way, though maybe not the easiest to decipher if you
aren't intricately familiar with how TCP functions.
## Linux box
net.ipv4.tcp_tso_win_divisor = 3
net.ipv4.tcp_adv_win_scale = 2
net.ipv4.tcp_app_win = 31
net.ipv4.tcp_window_scaling = 1
net.core.rmem_default = 107520
net.core.wmem_default = 107520
net.core.rmem_max = 131071
net.core.wmem_max = 131071
## pfsense box
# sysctl -a | grep -i tcp | grep space
net.inet.tcp.sendspace: 65228
net.inet.tcp.recvspace: 65228
I hope I got all the numbers, these are the default values, we didn't
change them.
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