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. _______________________________________________ Stgt-devel mailing list [email protected] https://lists.berlios.de/mailman/listinfo/stgt-devel
