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d8676c13de
git-svn-id: http://svn.code.sf.net/p/scst/svn/trunk@770 d57e44dd-8a1f-0410-8b47-8ef2f437770f
40 lines
1.5 KiB
Plaintext
40 lines
1.5 KiB
Plaintext
Setup:
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Target: 2.6.29 kernel, 64 bit, Intel E8400 CPU @ 3.00GHz, 4 GB RAM, SCST trunk
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revision 727 (which is close to the 1.0.1 release). A file of 1 GB residing
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on a tmpfs filesystem has been exported via SCST.
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Initiator: 2.6.29 kernel, 64 bit, Intel E6750 CPU @ 2.66 GHz, 2 GB RAM,
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openSUSE 11.0 userspace.
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Network: two MHGH28-XTC (MT26418) ConnectX InfiniBand HCA's connected back to
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back, which are DDR PCIe 1.0 HCA's. The IPoIB stack was configured with the
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default MTU of 2044 bytes on both interfaces and was using datagram mode.
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ib_read_bw reported a throughput of 1394 MB/s for this network, and netperf
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reported a TCP/IP throughput of 1200 MB/s (with default parameters).
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Results:
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Buffered I/O, block size of 512K (dd if=/dev/sdb of=/dev/null bs=512K):
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write-test: iSCSI-SCST 243 MB/s; IET 192 MB/s.
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read-test: iSCSI-SCST 291 MB/s; IET 223 MB/s.
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Buffered I/O, block size of 4 KB (dd if=/dev/sdb of=/dev/null bs=4K):
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write-test: iSCSI-SCST 43 MB/s; IET 42 MB/s.
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read-test: iSCSI-SCST 288 MB/s; IET 221 MB/s.
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Or: depending on the test scenario, SCST transfers data between 2% and
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30% faster via the iSCSI protocol over this network than IET.
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Note: at least for the tests with a block size of 4 KB, the initiator
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system was the bottleneck, not the target system.
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Something that is not relevant for this comparison, but interesting to
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know: with the SRP implementation in SCST the maximal read throughput
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is 1290 MB/s on the same setup.
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Measured by Bart Van Assche
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