From: Rob Evers <revers@redhat.com>
Date: Fri, 18 May 2012 18:08:56 +0000 (-0400)
Subject: [SCSI] scsi_dh_alua: backoff alua rtpg retry linearly vs. geometrically
X-Git-Tag: v3.6-rc1~103^2~67
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=bc97f4bb4490ff31b2be8e006f750d4187ef0c7e;p=pandora-kernel.git

[SCSI] scsi_dh_alua: backoff alua rtpg retry linearly vs. geometrically

Currently the backoff algorithm for when to retry alua rtpg
requests progresses geometrically as so:

2, 4, 8, 16, 32, 64... seconds.

This progression can lead to un-needed delay in retrying
alua rtpg requests when the rtpgs are delayed.  A less
aggressive backoff algorithm that is additive would not
lead to such large jumps when delays start getting long, but
would backoff linearly:

2, 4, 6, 8, 10... seconds.

Signed-off-by: Martin George <marting@netapp.com>
Signed-off-by: Rob Evers <revers@redhat.com>
Reviewed-by: Babu Moger <babu.moger@netapp.com>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>
---

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