3.17-stable review patch. If anyone has any objections, please let me know.
------------------ From: Nicholas Bellinger <[email protected]> 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 <[email protected]> Reported-by: Sagi Grimberg <[email protected]> Signed-off-by: Nicholas Bellinger <[email protected]> Signed-off-by: Greg Kroah-Hartman <[email protected]> --- 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; } -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
