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authorMike Christie <michaelc@cs.wisc.edu>2009-04-21 15:32:34 -0500
committerJames Bottomley <James.Bottomley@HansenPartnership.com>2009-04-27 10:10:06 -0500
commit1393109f23f8ad753a60a3e461c6caa96d8524f3 (patch)
treebc9400d252da0470d0ae9fb210f9afbd5479764d /drivers/scsi/cxgb3i
parentdd0af9f94e54efb13ee050ebac11909215ef02c2 (diff)
[SCSI] cxgb3i: fix cpu use abuse during writes
When doing a lot (128) of large writes (256K) we can hit the cxgb3_snd_win check pretty easily. The driver's xmit thread then takes 100% of the cpu. The driver should not be returning -EAGAIN for this problem. It should be returing -ENOBUFS, then when the window is opened again it should queue the xmit thread (it already wakes the xmit thread). Signed-off-by: Mike Christie <michaelc@cs.wisc.edu> Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
Diffstat (limited to 'drivers/scsi/cxgb3i')
-rw-r--r--drivers/scsi/cxgb3i/cxgb3i_offload.c4
-rw-r--r--drivers/scsi/cxgb3i/cxgb3i_pdu.c19
2 files changed, 13 insertions, 10 deletions
diff --git a/drivers/scsi/cxgb3i/cxgb3i_offload.c b/drivers/scsi/cxgb3i/cxgb3i_offload.c
index 4d8654cdbda..e11c9c180f3 100644
--- a/drivers/scsi/cxgb3i/cxgb3i_offload.c
+++ b/drivers/scsi/cxgb3i/cxgb3i_offload.c
@@ -1737,7 +1737,7 @@ int cxgb3i_c3cn_send_pdus(struct s3_conn *c3cn, struct sk_buff *skb)
c3cn_tx_debug("c3cn 0x%p, snd %u - %u > %u.\n",
c3cn, c3cn->write_seq, c3cn->snd_una,
cxgb3_snd_win);
- err = -EAGAIN;
+ err = -ENOBUFS;
goto out_err;
}
@@ -1775,6 +1775,8 @@ done:
out_err:
if (copied == 0 && err == -EPIPE)
copied = c3cn->err ? c3cn->err : -EPIPE;
+ else
+ copied = err;
goto done;
}
diff --git a/drivers/scsi/cxgb3i/cxgb3i_pdu.c b/drivers/scsi/cxgb3i/cxgb3i_pdu.c
index 7eebc9a7cb3..70910507117 100644
--- a/drivers/scsi/cxgb3i/cxgb3i_pdu.c
+++ b/drivers/scsi/cxgb3i/cxgb3i_pdu.c
@@ -400,17 +400,18 @@ int cxgb3i_conn_xmit_pdu(struct iscsi_task *task)
return 0;
}
- if (err < 0 && err != -EAGAIN) {
- kfree_skb(skb);
- cxgb3i_tx_debug("itt 0x%x, skb 0x%p, len %u/%u, xmit err %d.\n",
- task->itt, skb, skb->len, skb->data_len, err);
- iscsi_conn_printk(KERN_ERR, task->conn, "xmit err %d.\n", err);
- iscsi_conn_failure(task->conn, ISCSI_ERR_XMIT_FAILED);
+ if (err == -EAGAIN || err == -ENOBUFS) {
+ /* reset skb to send when we are called again */
+ tdata->skb = skb;
return err;
}
- /* reset skb to send when we are called again */
- tdata->skb = skb;
- return -EAGAIN;
+
+ kfree_skb(skb);
+ cxgb3i_tx_debug("itt 0x%x, skb 0x%p, len %u/%u, xmit err %d.\n",
+ task->itt, skb, skb->len, skb->data_len, err);
+ iscsi_conn_printk(KERN_ERR, task->conn, "xmit err %d.\n", err);
+ iscsi_conn_failure(task->conn, ISCSI_ERR_XMIT_FAILED);
+ return err;
}
int cxgb3i_pdu_init(void)