From mboxrd@z Thu Jan 1 00:00:00 1970 From: Bart Van Assche Subject: Re: SRPT and SCST Date: Mon, 14 Dec 2009 21:41:08 +0100 Message-ID: References: <3142CEFB1403044F9954E2DF6C85660FBB34BD@orca.penguincomputing.com> <3142CEFB1403044F9954E2DF6C85660FBB34BF@orca.penguincomputing.com> <654FA770A883FB43BAF3CB0B1E1DAC8C01C8C4DD@orca.penguincomputing.com> <4AF29201.6000606@penguincomputing.com> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Return-path: In-Reply-To: <4AF29201.6000606-pabcTyWEv4ZW60MLeMDbCVaTQe2KTcn/@public.gmane.org> Sender: linux-rdma-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org To: Philip Pokorny Cc: scst-devel-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org, linux-rdma-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, Arend Dittmer List-Id: linux-rdma@vger.kernel.org On Thu, Nov 5, 2009 at 9:51 AM, Philip Pokorny wrote: >> >> [ ... ] >> >> [ 8864.326702] <6>[0]: scst_queue_retry_cmd:1099:TGT QUEUE FULL: >> incrementing retry_cmds 1 >> [ 8864.326709] <6>[0]: scst_queue_retry_cmd:1106:Some command(s) finished, >> direct retry (finished_cmds=2023031, tgt->finished_cmds=2023137, >> retry_cmds=0) >> [ ... ] (replying to an e-mail of one month ago) The above issue should be fixed in SCST revision 1391, together with the following changes: * Support for OFED 1.5. * The maximum supported value for the ib_srp kernel module parameter srp_sg_tablesize has been increased from 58 to 128, at least when ib_srpt is loaded with default parameters. Modifying the new ib_srpt kernel module parameter srp_max_rdma_size makes it possible to support even higher values of srp_sg_tablesize. * Various small performance improvements. The results I obtained with QDR HCA's, a RAM disk as target and a vanilla 2.6.27.39 kernel + CFQ on the initiator system are: * for asynchronous (buffered) I/O, writing speeds up to 1070 MB/s (srp_sg_tablesize = 128; block size = 16 KB). * for asynchronous (buffered) I/O, reading speeds up to 930 MB/s (srp_sg_tablesize = 12; block size = 16 KB). * for direct (non-buffered) I/O, writing speeds up to 1000 MB/s (srp_sg_tablesize = 32; block size = 2 MB). * for direct (non-buffered) I/O, reading speeds up to 1710 MB/s (srp_sg_tablesize = 16; block size = 64 MB). Bart. -- To unsubscribe from this list: send the line "unsubscribe linux-rdma" in the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org More majordomo info at http://vger.kernel.org/majordomo-info.html