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NTB: MFV c336acd3: memcpy lockup workaround

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The system will appear to lockup for long periods of time due to the NTB
driver spending too much time in memcpy.  Avoid this by reducing the
number of packets that can be serviced on a given interrupt.

Authored by:	Jon Mason
Obtained from:	Linux
Sponsored by:	EMC / Isilon Storage Division
This commit is contained in:
cem 2015-10-11 21:01:14 +00:00
parent fb61343c6e
commit 557f35d9bf
1 changed files with 3 additions and 2 deletions
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5
sys/dev/ntb/if_ntb/if_ntb.c
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@ -853,7 +853,8 @@ ntb_rx_pendq_full(void *arg)
static void
ntb_transport_rx(struct ntb_transport_qp *qp)
{
int rc, i;
uint64_t i;
int rc;
/*
* Limit the number of packets processed in a single interrupt to
@ -861,7 +862,7 @@ ntb_transport_rx(struct ntb_transport_qp *qp)
*/
mtx_lock(&qp->transport->rx_lock);
CTR0(KTR_NTB, "RX: transport_rx");
for (i = 0; i < NTB_RX_MAX_PKTS; i++) {
for (i = 0; i < qp->rx_max_entry; i++) {
rc = ntb_process_rxc(qp);
if (rc != 0) {
CTR0(KTR_NTB, "RX: process_rxc failed");