Hugepage Block Device Driver Announced For The Linux Kernel
Written by Michael Larabel in Linux Kernel on 15 June 2014 at 09:50 AM EDT. 4 Comments
Linux Kernel
Dr. Greg Wettstein and his dog Izzy have announced the release of the Hugepage Block Device Driver for the Linux kernel.

Greg explains this Hugepage Block Device driver, "The HPD driver implements a dynamically configurable RAM based block device which uses the kernel hugepage infrastructure and magazines to provide the memory based backing for the block devices. It borrows heritage from the existing brd ramdisk code with the primary differences being dynamic configurability and the backing methodology...the HPD driver may offer one of the most useful applications of this [Hugepage] infrastructure. There are obvious advantages in a ramdisk to handling the backing store in larger size units and NUMA support falls out naturally since the hugepage infrastructure is NUMA aware."

In terms of the relevance to the Linux storage industry with this HPD driver, "We have found the driver to be particularly useful in testing our SCST implementation, extensions and infrastructure. It is capable of sustaining line-rate 10+ GBPS throughput which allows target infrastructure to be tested and verified with FIO running in verify mode. The NULLIO target, while fast of course, does not allow verification of I/O since there is no persistent backing. Measured I/O latency on 4K block sizes is approximately five micro-seconds. Based on that Izzy thought we should get this released for our fellow brethren in the storage appliance industry. He suggests that pretty impressive appliance benchmark numbers can be obtained by using an HPD based cache device with bcache in writeback mode..... :-)"

More information on this just-announced block device driver can be found via the kernel mailing list.
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Michael Larabel is the principal author of Phoronix.com and founded the web-site in 2004 with a focus on enriching the Linux hardware experience and being the largest web-site devoted to Linux hardware reviews, particularly for products relevant to Linux gamers and enthusiasts but also commonly reviewing servers/workstations and embedded Linux devices. Michael has written more than 10,000 articles covering the state of Linux hardware support, Linux performance, graphics hardware drivers, and other topics. Michael is also the lead developer of the Phoronix Test Suite, Phoromatic, and OpenBenchmarking.org automated testing software. He can be followed via Twitter or contacted via MichaelLarabel.com.

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