On Mon, Mar 30, 2009 at 7:33 PM, Vladislav Bolkhovitin <vst@xxxxxxxx> 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 as follows: 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. Bart. -- To unsubscribe from this list: send the line "unsubscribe linux-scsi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
