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Configure esxi 4 vSwitch to jumbo frame

>esxcfg-vswitch -m 9000 vSwitch0

>excfg-vswitch -l

http://blog.scottlowe.org/2009/06/23/new-user-networking-config-guide/

Configure Snow Leopard to mount nfs using ports < 1024

Add the -o resvport as the mount option because Linux server will refuse NFS requests coming from a non-reserved (<1024) source port

VMware Server Tuning

http://peterkieser.com/technical/vmware-server-issues/

TCP/IP tuning

How To: Network / TCP / UDP Tuning This is a very basic step by step description of how to improve the performance networking (TCP & UDP) on Linux 2.4+ for high-bandwidth applications. These settings are especially important for GigE links. Jump to Quick Step or All The Steps. Assumptions This howto assumes that the […]

socket options = IPTOS_LOWDELAY TCP_NODELAY SO_SNDBUF=8192 SO_RCVBUF=8192 in smb.conf

I have set this socket option as one of the performance tuning configuration on my production samba server long ago in the 100M/bit network era. Many later configured samba servers inherited this configuration naturally. However when I test the samba performance of my latest configured Dell PowerEdge Data server, the result is astonishing. Its throughput […]

VMware Server 2.0.2 on CentOS 5.5

Remember not to install the kvm kernel modules, otherwise you will get the error : failed to initialize monitor device when start a vm under VMware Server 2.0. BTW, you also need to follow instructions in this page to make VMware Server 2.0 work properly under CentOS 5.5. As a result, it seems that I […]

Upgrade chillispot 1.1.0 to coovachilli 1.2.3

I used chillispot as the wireless LAN captive portal for long time. It is one of the best FREE captive portal. Though it is quite simple and with less optimal performance, I used for our department’s Wireless LAN login. However, it is defunc now. The successor of it is coovachilli but the documentation of it […]

SoundFlower for Mac

A software on Mac which can allow the routing of sound from Software A to Software B. For example, you can route Youtube’s output to Audacity as input.

Broadband Router Modding

Recommended Model for installing DD-WRT

1. NetGear WR3500L : Broadcom BCM4718A(450Mhz) chip, 8MB, flash, 64MB RAM, HK$900

2. ASUS RT-N16: Broadcom BCM4718 (533Mhz) chip, 32MB Flash, 128 MB RAM, HK$899

3. Buffalo WZR-HP-G300NH: Atheros AR91321 (400Mhz) chip, 32MB Flash, 128 MB RAM, HK$700

4. TP-Link WR1043ND: Atheros AR9132 (400MHz) chip, 8MB Flash, 32MB RAM,HK$538

5. […]

Upgrade ESXI 4.0 update 2 to ESXi 4.1

Use the VMware host update utility to upgrade the host failed. From instructions from internet, try to upload the unpacked upgrade.zip to the local datastore of the server and run : esxupdate update -m metadata.zip. The upgrade completed without problem on my two ESXI 4 server (One is Dell PE T610, the other is a […]