This is a note to let you know that I've just added the patch titled
[PATCH 02/28] ppp: Don't stop and restart queue on every TX packet
to the 3.3-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
ppp-don-t-stop-and-restart-queue-on-every-tx-packet.patch
and it can be found in the queue-3.3 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <[email protected]> know about it.
>From 10f036f94d6f5e9399db376cd383e039b742ec76 Mon Sep 17 00:00:00 2001
From: David Woodhouse <[email protected]>
Date: Tue, 24 Apr 2012 22:09:47 -0400
Subject: [PATCH 02/28] ppp: Don't stop and restart queue on every TX packet
From: David Woodhouse <[email protected]>
[ This combines upstream commit
e675f0cc9a872fd152edc0c77acfed19bf28b81e and follow-on bug fix
commit 9a5d2bd99e0dfe9a31b3c160073ac445ba3d773f ]
For every transmitted packet, ppp_start_xmit() will stop the netdev
queue and then, if appropriate, restart it. This causes the TX softirq
to run, entirely gratuitously.
This is "only" a waste of CPU time in the normal case, but it's actively
harmful when the PPP device is a TEQL slave â the wakeup will cause the
offending device to receive the next TX packet from the TEQL queue, when
it *should* have gone to the next slave in the list. We end up seeing
large bursts of packets on just *one* slave device, rather than using
the full available bandwidth over all slaves.
This patch fixes the problem by *not* unconditionally stopping the queue
in ppp_start_xmit(). It adds a return value from ppp_xmit_process()
which indicates whether the queue should be stopped or not.
It *doesn't* remove the call to netif_wake_queue() from
ppp_xmit_process(), because other code paths (especially from
ppp_output_wakeup()) need it there and it's messy to push it out to the
other callers to do it based on the return value. So we leave it in
place â it's a no-op in the case where the queue wasn't stopped, so it's
harmless in the TX path.
Signed-off-by: David Woodhouse <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
drivers/net/ppp/ppp_generic.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
--- a/drivers/net/ppp/ppp_generic.c
+++ b/drivers/net/ppp/ppp_generic.c
@@ -968,7 +968,6 @@ ppp_start_xmit(struct sk_buff *skb, stru
proto = npindex_to_proto[npi];
put_unaligned_be16(proto, pp);
- netif_stop_queue(dev);
skb_queue_tail(&ppp->file.xq, skb);
ppp_xmit_process(ppp);
return NETDEV_TX_OK;
@@ -1063,6 +1062,8 @@ ppp_xmit_process(struct ppp *ppp)
code that we can accept some more. */
if (!ppp->xmit_pending && !skb_peek(&ppp->file.xq))
netif_wake_queue(ppp->dev);
+ else
+ netif_stop_queue(ppp->dev);
}
ppp_xmit_unlock(ppp);
}
Patches currently in stable-queue which might be from [email protected]
are
queue-3.3/ppp-don-t-stop-and-restart-queue-on-every-tx-packet.patch
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