Commit ecc3bc98 authored Mar 27, 2014 by Matthew Wilcox Committed by Christoph Hellwig May 28, 2014

fusion: Add free msg frames to the head, not tail of list



Reusing a msg frame quickly means it's still cache-hot.  This yields
a small but noticable performance improvement in a well-known database
benchmark.  This improvement is already present in the mpt3sas driver.

Signed-off-by: Matthew Wilcox <matthew.r.wilcox@intel.com>
Reviewed-by: Nicholas Bellinger <nab@linux-iscsi.org>
Reviewed-by: Praveen Krishnamoorthy <Praveen.krishnamoorthy@lsi.com>
Acked-by: Sreekanth Reddy <Sreekanth.reddy@lsi.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>

parent 049b3e81

drivers/message/fusion/mptbase.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -1037,7 +1037,7 @@ mpt_free_msg_frame(MPT_ADAPTER ioc, MPT_FRAME_HDR mf)
		goto out;
		/* signature to know if this mf is freed */
		mf->u.frame.linkage.arg1 = cpu_to_le32(0xdeadbeaf);
		list_add_tail(&mf->u.frame.linkage.list, &ioc->FreeQ);
		list_add(&mf->u.frame.linkage.list, &ioc->FreeQ);
		#ifdef MFCNT
		ioc->mfcnt--;
		#endif