That being said, I wouldn't get a quad Opteron system anyways now that the dual core Opterons are available. A DP+DC system would be faster and cheaper than a pure quad system. Unless of course, I needed a QP+DC for 8-way SMP.
Anjan Dave wrote:
Wasn't the context switching issue occurring in specific cases only?
I haven't seen any benchmarks for a 50% performance difference. Neither have I seen any benchmarks of pure disk IO performance of specific models of Dell vs HP or Sun Opterons.
EMC you can file an RPQ via your sales contacts to get it approved, though not sure how lengthy/painful that process might be, or if it's gonna be worth it.
Read the article devoted to the v40z on anandtech.com.
I am also trying to get a quad-Opteron versus the latest quad-XEON
Dell (6850), but it's hard to justify a difference between a 15K dell versus a 30k v40z for a 5-8% performance gain (read the XEON Vs.
Database comparo on anandtech.com)...
15k vs 30k is indeed a big difference. But also realize that Postgres has a specific benefit to Opterons versus Xeons. The context switching storm happens less on an Opteron for some reason.
I would venture a much greater benefit than 5-8%, more like 10-50%.
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