From: Nicholas Bellinger Date: Sun, 5 Oct 2014 09:13:03 +0000 (-0700) Subject: iser-target: Disable TX completion interrupt coalescing X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=0d0f660d882c1c02748ced13966a2413aa5d6cc2;p=linux-beck.git iser-target: Disable TX completion interrupt coalescing 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 Reported-by: Sagi Grimberg Cc: # 3.13+ Signed-off-by: Nicholas Bellinger --- diff --git a/drivers/infiniband/ulp/isert/ib_isert.c b/drivers/infiniband/ulp/isert/ib_isert.c index 40969b683fdd..f7191128b725 100644 --- a/drivers/infiniband/ulp/isert/ib_isert.c +++ b/drivers/infiniband/ulp/isert/ib_isert.c @@ -2183,7 +2183,7 @@ isert_put_response(struct iscsi_conn *conn, struct iscsi_cmd *cmd) 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"); @@ -2882,7 +2882,7 @@ isert_put_datain(struct iscsi_conn *conn, struct iscsi_cmd *cmd) &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; }