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Great report.
Btw, on page2, “The big picture”, MySQL is missing as one of the core component?
haha, good catch, and I went to MySQL conference with this ;-D
“tuning kernels for our high-performance networking” – Domas, care to share anything you found here ?
John, stuff like LVS would be very conservative at hash allocations, and as we maintain thousands of connections via LVS directors, increasing internal memory structures to facilitate those specific tasks helped a lot.
Of course, there’re few minor issues like ones at http://dammit.lt/2006/09/12/mysql-tcp-network-tuning/