Hello, This could be useful for improving a poor performance at some environments: "Low latency is a key factor to a good user experience. With the Debian GNU / Linux 6.x kernel tuning, combined with the previous articles hints about XenServer I/O latency, tuning filesystems, configuring multipath, and data storage, we reduced eighty-four times our virtual block device latency at our environment. Thousands concurrent synchronous writes of random small files on filesystems with millions of them while honoring write barriers for POSIX compliance, stress the limits of the data storage, file systems, kernel I/O, virtualization I/O, hardware data paths. These are our findings and Linux kernel tunings in Cyrus IMAP e-mail servers aggregator under heavy load production since November 2011." http://www.techforce.com.br/news/linux_blog/debian_linux_kernel_tuning_low_latency_small_files Regards Andre Felipe Machado
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