poor pcie ssd driver performance on linux 2.6.18(centos 5.7)
Hi all
I have a pcie driver for SSD which reaches a throughput of 3Gbytes/sec when working in centos 6.5(linux 2.6.32).
When I run the same driver under centos 5.7(linux 2.6.18) after performing some minor modifications I can only reach 400Mbytes/sec.
I am using the fio tool on the raw device in order to test performance.The driver uses the blk_queue_make _request function to regiter the bio handling function in order to override the linux elevator.
Can you please tell what could be the reason for the drop in performance?
BR
Oren
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