Vladislav Bolkhovitin schrieb:Hi All,
I set up http://scst.sourceforge.net/comparison.html page, which compares features of existing SCSI target subsystems for Linux. The comparison includes SCST, STGT, IET and LIO.
I might be not fully correct somewhere, so, if you don't agree with me about some item(s) in the comparison table, please let me know and I will fix that.
Performance is a bit debatable.
I made some simple SCST and STGT tests last week, there were some where SCST won, there were some where STGT won.
What was surprising to me, although STGT has a bigger CPU impact than SCST, STGT was faster when reading from an encrypted (dm-crypt) volume, on a system where the CPU is the bottleneck (it can't decrypt as fast as HDD can deliver data).
STGT was much slower when reading from a non-encrypted volume, when target had "blockdev --setra 16384 ..." for a given target.
On the other hand, STGT was faster than SCST with default blockdev readahead settings (256).
If anyone's interested, I can show results in a readable form on Monday (right now, I have only raw data which is pretty long and would be hard to compare).