[stgt] ISCSI-SCST performance (with also IET and STGT data)
Bart Van Assche
bart.vanassche at gmail.com
Wed Apr 1 22:14:24 CEST 2009
On Mon, Mar 30, 2009 at 7:33 PM, Vladislav Bolkhovitin <vst at vlnb.net> wrote:
> I. SEQUENTIAL ACCESS OVER SINGLE LINE
> 1. # dd if=/dev/sdX of=/dev/null bs=512K count=2000
> ISCSI-SCST IET STGT
> NULLIO: 106 105 103
> FILEIO/CFQ: 82 57 55
> FILEIO/deadline 69 69 67
> BLOCKIO/CFQ 81 28 -
> BLOCKIO/deadline 80 66 -
I have repeated some of these performance tests for iSCSI over IPoIB
(two DDR PCIe 1.0 ConnectX HCA's connected back to back). The results
for the buffered I/O test with a block size of 512K (initiator)
against a file of 1GB residing on a tmpfs filesystem on the target are
write-test: iSCSI-SCST 243 MB/s; IET 192 MB/s.
read-test: iSCSI-SCST 291 MB/s; IET 223 MB/s.
And for a block size of 4 KB:
write-test: iSCSI-SCST 43 MB/s; IET 42 MB/s.
read-test: iSCSI-SCST 288 MB/s; IET 221 MB/s.
Or: depending on the test scenario, SCST transfers data between 2% and
30% faster via the iSCSI protocol over this network.
Something that is not relevant for this comparison, but interesting to
know: with the SRP implementation in SCST the maximal read throughput
is 1290 MB/s on the same setup.
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