? Nowadays dilemmas in enterprise-class storage system & motivation --
The model of most storage system is ?Front-end cards + CPU + back-end
magnetic media hard drive?, in such system, the hard drive is very slow in
terms of its capability in random accessing - roughly 200IO per second, in
contrast, the processor is very fast, therefore many software stack can
tolerate waste of CPU cycle for exploiting capabilities of hard drive.
In addition, regularly software for SAN is developed under kernel space
in order to achieve low latency - few milliseconds per request, and IO pressure
in scenario of heavy workload. Usually software in user-space with POSIX is
slow. However kernel-space developing is nightmare for engineers, even we have
approaches to simulate these code under user-space.
However, so far flash is coming to popular, the gap between CPU and media
is overturned, a single flash card can be easy to reach 1M iops, if plug 10
such cards inside a server, the processor is hard to back. Thus, today?s
challenge in flash storage is to exploit the capability of processor,
ironically. In addition to this purpose, move to user-space is also a
motivation, if move to user-space is OS-bypass rather than moving to POSIX.
Best
- March
On Nov 14, 2013, at 8:03 PM, St Leger, Jim <jim.st.leger at intel.com> wrote:
> March:
> How long have you been working on the project?
> What is your goal for final implementation?
> Do you have any progress so far?
> Jim
>
> From: March Jane <unix.march at gmail.com>
> Date: November 12, 2013 at 2:27:37 AM PST
> To: <dev at dpdk.org>
> Subject: [dpdk-dev] Fwd: dpdk-iokit: Turn dpdk into the IO field.
>
> Hi,
> dpdk folks,
> I am working on a project which is offering a complete IO stack for dpdk,
> particularly a SCSI target stack in dpdk ? dpdk-iokit, once I finished my
> initial code, will upload to github. I would like to know if there is any
> other people is working on that purpose?
>
>
> - march
>
