Bart Van Assche wrote:
On Jan 22, 2008 12:33 PM, Vladislav Bolkhovitin <[EMAIL PROTECTED]
<mailto:[EMAIL PROTECTED]>> wrote:
What are the new SRPT/iSER numbers?
You can find the new performance numbers below. These are all numbers
for reading from the remote buffer cache, no actual disk reads were
performed. The read tests have been performed with dd, both for a block
size of 512 bytes and of 1 MB. The tests with small block size learn
more about latency, while the tests with large block size learn more
about the maximal possible throughput.
If you want to compare performance of 512b vs 1MB blocks, your
experiment isn't fully correct. You should use "iflag=direct" dd option
for that.
.............................................................................................
. . STGT read SCST read . STGT
read SCST read .
. . performance performance .
performance performance .
. . (0.5K, MB/s) (0.5K, MB/s) . (1 MB,
MB/s) (1 MB, MB/s) .
.............................................................................................
. Ethernet (1 Gb/s network) . 77 78 .
77 89 .
. IPoIB (8 Gb/s network) . 163 185 .
201 239 .
. iSER (8 Gb/s network) . 250 N/A .
360 N/A .
. SRP (8 Gb/s network) . N/A 421 .
N/A 683 .
.............................................................................................
My conclusion from the above numbers: the performance difference between
STGT and SCST is small for a Gigabit Ethernet network. The faster the
network technology, the larger the difference between SCST and STGT.
This is what I expected
Bart.
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