>-----Original Message-----
>From: Brandeburg, Jesse [mailto:jesse.brandeb...@intel.com]
>Sent: Friday, October 08, 2010 11:03 AM
>To: Chris Friesen
>Cc: e1000-devel@lists.sourceforge.net; Allan, Bruce W; Kirsher, Jeffrey T;
>Ronciak, John
>Subject: Re: [E1000-devel] ixgbe driver stuck with interrupts off but
>packets in rx ring
>
>
>
>On Fri, 8 Oct 2010, Chris Friesen wrote:
>
>>
>> Hi all,
>>
>> We've got an 82599 device using the XAUI interface over an ATCA
>> backplane data link, using version 2.0.72.4 of the ixgbe driver from
>> sourceforge. (We also tried 2.1.4 and it didn't help.)
>>
>> As I mentioned a while back, I'm investigating an issue where under load
>> we eventually suddenly stop receiving packets. We're sending out
>> packets, I can see the reply being sent with tcpdump on other hosts, but
>> we never receive the reply. The driver doesn't complain about loss of
>> carrier (and doesn't indicate dropped packets).
>>
>> I added some instrumentation that triggers once we haven't received any
>> packets for at least 300ms (and I know that we should be receiving
>> some). The instrumentation dumps the values of various
>> interrupt-related registers on the 82599 and also walks the rx rings to
>> see if there are any packets ready to process.
>
>I guess, first did you end up with the wmb/rmb patches added by IBM for
>the PPC stuff upstream? I'm not sure we have those in our sf.net driver
>yet.
I believe I added this patch to the source forge driver around 2.0.103 so it
"should" be in the 2.1.4 driver. Assuming this is the patch you were talking
about.
[r...@dcs_desk CORE]# cvs diff -r 1.1317 -r 1.1318 -up ixgbe_main.c
Index: ixgbe_main.c
===================================================================
RCS file: /home/cvsroot/ladsw/ixgbe/linux/oplin/src/CORE/ixgbe_main.c,v
retrieving revision 1.1317
retrieving revision 1.1318
diff -u -p -r1.1317 -r1.1318
--- ixgbe_main.c 10 Aug 2010 01:41:17 -0000 1.1317
+++ ixgbe_main.c 10 Aug 2010 20:42:13 -0000 1.1318
@@ -453,6 +453,7 @@ static bool ixgbe_clean_tx_irq(struct ix
while ((eop_desc->wb.status & cpu_to_le32(IXGBE_TXD_STAT_DD)) &&
(count < tx_ring->work_limit)) {
bool cleaned = false;
+ rmb(); /* read buffer_info after eop_desc */
for ( ; !cleaned; count++) {
tx_desc = IXGBE_TX_DESC_ADV(tx_ring, i);
tx_buffer_info = &tx_ring->tx_buffer_info[i];
Thanks,
-Don
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