This is a note to let you know that I've just added the patch titled
iser-target: Disable TX completion interrupt coalescing
to the 3.17-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
iser-target-disable-tx-completion-interrupt-coalescing.patch
and it can be found in the queue-3.17 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 0d0f660d882c1c02748ced13966a2413aa5d6cc2 Mon Sep 17 00:00:00 2001
From: Nicholas Bellinger <nab@xxxxxxxxxxxxxxx>
Date: Sun, 5 Oct 2014 02:13:03 -0700
Subject: iser-target: Disable TX completion interrupt coalescing
From: Nicholas Bellinger <nab@xxxxxxxxxxxxxxx>
commit 0d0f660d882c1c02748ced13966a2413aa5d6cc2 upstream.
This patch explicitly disables TX completion interrupt coalescing logic
in isert_put_response() and isert_put_datain() that was originally added
as an efficiency optimization in commit 95b60f07.
It has been reported that this change can trigger ABORT_TASK timeouts
under certain small block workloads, where disabling coalescing was
required for stability. According to Sagi, this doesn't impact
overall performance, so go ahead and disable it for now.
Reported-by: Moussa Ba <moussaba@xxxxxxxxxx>
Reported-by: Sagi Grimberg <sagig@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Nicholas Bellinger <nab@xxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/infiniband/ulp/isert/ib_isert.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
--- a/drivers/infiniband/ulp/isert/ib_isert.c
+++ b/drivers/infiniband/ulp/isert/ib_isert.c
@@ -2185,7 +2185,7 @@ isert_put_response(struct iscsi_conn *co
isert_cmd->tx_desc.num_sge = 2;
}
- isert_init_send_wr(isert_conn, isert_cmd, send_wr, true);
+ isert_init_send_wr(isert_conn, isert_cmd, send_wr, false);
pr_debug("Posting SCSI Response IB_WR_SEND >>>>>>>>>>>>>>>>>>>>>>\n");
@@ -2884,7 +2884,7 @@ isert_put_datain(struct iscsi_conn *conn
&isert_cmd->tx_desc.iscsi_header);
isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
isert_init_send_wr(isert_conn, isert_cmd,
- &isert_cmd->tx_desc.send_wr, true);
+ &isert_cmd->tx_desc.send_wr, false);
isert_cmd->rdma_wr.s_send_wr.next = &isert_cmd->tx_desc.send_wr;
wr->send_wr_num += 1;
}
Patches currently in stable-queue which might be from nab@xxxxxxxxxxxxxxx are
queue-3.17/target-fix-queue-full-status-null-pointer-for-scf_transport_task_sense.patch
queue-3.17/target-fix-aptpl-metadata-handling-for-dynamic-mappedluns.patch
queue-3.17/qla_target-don-t-delete-changed-nacls.patch
queue-3.17/iser-target-disable-tx-completion-interrupt-coalescing.patch
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