(resending as plain text) On Thu, Nov 5, 2009 at 10:51 AM, Philip Pokorny <ppoko...@penguincomputing.com> wrote: > > [ ... ] > > Performance (when it's working) is generally good at 800MB/sec aggregate, but > we'd like to see better. It appeared we were getting 1.3GB/s at one point.
(replying to an e-mail that was posted several months ago) You might have hit a limitation of Linux' asynchronous I/O subsystem (at the SRP initiator side). Asynchronous I/O performance has been improved significantly in the 2.6.33 kernel. The throughput I measured with fio, QDR HCA's and a 2.6.34 initiator is as follows: * 940 MB/s for asynchronous writes and 1240 MB/s for asynchronous reads and a block size of 64 KB. * 2200 MB/s for direct writes and 2900 MB/s for direct reads and a block size of 64000 KB. Bart. -- To unsubscribe from this list: send the line "unsubscribe linux-rdma" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
