On Tue, 2014-10-07 at 09:58 +0300, Sagi Grimberg wrote: > On 10/6/2014 5:15 AM, Nicholas A. Bellinger wrote: > > From: Nicholas Bellinger <nab@xxxxxxxxxxxxxxx> > > > > 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> > > Cc: Moussa Ba <moussaba@xxxxxxxxxx> > > Reported-by: Sagi Grimberg <sagig@xxxxxxxxxxxxxxxxxx> > > Cc: Sagi Grimberg <sagig@xxxxxxxxxxxxxxxxxx> > > Cc: <stable@xxxxxxxxxxxxxxx> # 3.13+ > > Signed-off-by: Nicholas Bellinger <nab@xxxxxxxxxxxxxxx> > > --- > > drivers/infiniband/ulp/isert/ib_isert.c | 4 ++-- > > 1 file changed, 2 insertions(+), 2 deletions(-) > > > > diff --git a/drivers/infiniband/ulp/isert/ib_isert.c b/drivers/infiniband/ulp/isert/ib_isert.c > > index 40969b6..f719112 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); > > I Would like to avoid taking the conn_mutex in the IO path. Yes, please. > Care to respin this with avoiding taking the mutex? Or you want me to? Let's keep this patch as is for -rc1 so it can be easily picked up for stable, especially considering that it's been verified by Moussa for some time. > I have a couple of patches in the pipe anyway... > Thank you Sagi. --nab -- To unsubscribe from this list: send the line "unsubscribe linux-scsi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
