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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>
This commit is contained in:
Matthew Wilcox 2014-03-27 16:40:35 -04:00 committed by Christoph Hellwig
parent 049b3e81d7
commit ecc3bc9825
1 changed files with 1 additions and 1 deletions
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2
drivers/message/fusion/mptbase.c
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@ -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