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Upgrading Web Application's Systems' Kernels for IW10 & other related improvements - upgrade all machines? LB first? Most important?

Stackers - We're making the push to upgrade the systems for our web app to take advantage of the various TCP improvements becoming more readily available (e.g. ...
1
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1answer
109 views

windows 8 taking long time to open Mac server share [closed]

I have a machine running windows 8 on a Mac server environment. When mounting or accessing a small/empty shared folder on the network the computer connects fine. When accessing another shared folder ...
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1answer
135 views

Linux unfriendly IIS/ASP.NET :-) : Quick download on windows but slow on linux [closed]

This particular web site (gops.tay.be) serves objects quick if I try to request the page using windows, but I get them very slow if trying using linux. There is no difference if I use browser or curl: ...
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1answer
846 views

linux initcwnd and initrwnd via /etc/sysctl.conf

Folks, As we know, the 3.x kernels have higher TCP default connection values, such as initcwnd and initrwnd. For 2.x friends, is there a way to set these in /etc/sysctl.conf instead of the ip route ...
0
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1answer
608 views

Long TCP/IP Connect time (20-40s) with Apache 2.4, mod_proxy_ajp, Tomcat 7.0.39 running on Windows Server 2008 R2

The initial connection to an Apache HTTP Server is taking a very long time (20-40s), but the subsequent connection is very fast (<50ms). I use Apache HTTP Server as a load balancer using ...
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1answer
266 views

How to disable “slow start” on Linux 2.6.18-164.2.1.el5 [closed]

I have a problem: sending small files (16MB) works with at most ~ 2MB/s speed. While on larger files, 16MB/s is easily achievable. When I was checking details, it looks that speed of transfers starts ...
7
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2answers
459 views

What are possible downsides to setting a (very) large initcwnd for high-bandwidth connections?

I have been experimenting with the TCP parameters in Linux (with a 3.5 kernel). Basically concerning this connection: Server: Gigabit uplink in datacenter, actual bandwidth (due to sharing uplinks) ...
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2answers
6k views

Clarification about Linux TCP window size and delays

I have delays when sending data through a TCP channel I am not able to understand. The link is a 1Gb link with a end to end latency of roughly 40ms. In my current setup, latency (the time from one ...
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1answer
160 views

Why do network speeds gradually increase for big downloads over HTTP? [closed]

I've had certain instances of downloading from websites (right now I'm downloading the latest version of Ubuntu from virginmedia.com) where the speed of the download gradually increases (increasing by ...
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2answers
2k views

Linux Slow Start: Changing ip route does not have any effect on initial window

I changed the tcp initial window in my machine to 10 as shown below [user@site etc]$ sudo ip route change default via 17.255.209.1 dev eth0 proto static initcwnd 10 And changed ...
4
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2answers
551 views

Increasing tcp slow start Initial Window in linux 3.0 kernel

I was checking the IW for my site and realized that its 4. [user~]$ sudo tcpdump -n -i any 'tcp[tcpflags] & (tcp-syn|tcp-ack) == tcp-syn and port 80' tcpdump: verbose output suppressed, use -v or ...
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1answer
1k views

Finding out TCP Initial Window segment size in linux

I run Centos [user ~]$ cat /etc/redhat-release CentOS release 6.2 (Final) With kernel 3.0.4-x86_64-linode21 How do I check the TCP initial window size in my OS? I need to verify that the IW is ...