From 8edc0e624db3756783233e464879eb2e3b904c13 Mon Sep 17 00:00:00 2001 From: Hiroaki SHIMODA Date: Wed, 10 Oct 2012 15:34:20 +0000 Subject: [PATCH] e1000e: Change wthresh to 1 to avoid possible Tx stalls This patch originated from Hiroaki SHIMODA but has been modified by Intel with some minor cleanups and additional commit log text. Denys Fedoryshchenko and others reported Tx stalls on e1000e with BQL enabled. Issue was root caused to hardware delays. They were introduced because some of the e1000e hardware with transmit writeback bursting enabled, waits until the driver does an explict flush OR there are WTHRESH descriptors to write back. Sometimes the delays in question were on the order of seconds, causing visible lag for ssh sessions and unacceptable tx completion latency, especially for BQL enabled kernels. To avoid possible Tx stalls, change WTHRESH back to 1. The current plan is to investigate a method for re-enabling WTHRESH while not harming BQL, but those patches will be later for net-next if they work. please enqueue for stable since v3.3 as this bug was introduced in commit 3f0cfa3bc11e7f00c9994e0f469cbc0e7da7b00c Author: Tom Herbert Date: Mon Nov 28 16:33:16 2011 +0000 e1000e: Support for byte queue limits Changes to e1000e to use byte queue limits. Reported-by: Denys Fedoryshchenko Tested-by: Denys Fedoryshchenko Signed-off-by: Hiroaki SHIMODA CC: eric.dumazet@gmail.com CC: therbert@google.com Signed-off-by: Jesse Brandeburg Signed-off-by: David S. Miller --- drivers/net/ethernet/intel/e1000e/e1000.h | 6 +++--- drivers/net/ethernet/intel/e1000e/netdev.c | 2 +- 2 files changed, 4 insertions(+), 4 deletions(-) diff --git a/drivers/net/ethernet/intel/e1000e/e1000.h b/drivers/net/ethernet/intel/e1000e/e1000.h index cb3356c..04668b4 100644 --- a/drivers/net/ethernet/intel/e1000e/e1000.h +++ b/drivers/net/ethernet/intel/e1000e/e1000.h @@ -175,13 +175,13 @@ struct e1000_info; /* * in the case of WTHRESH, it appears at least the 82571/2 hardware * writes back 4 descriptors when WTHRESH=5, and 3 descriptors when - * WTHRESH=4, and since we want 64 bytes at a time written back, set - * it to 5 + * WTHRESH=4, so a setting of 5 gives the most efficient bus + * utilization but to avoid possible Tx stalls, set it to 1 */ #define E1000_TXDCTL_DMA_BURST_ENABLE \ (E1000_TXDCTL_GRAN | /* set descriptor granularity */ \ E1000_TXDCTL_COUNT_DESC | \ - (5 << 16) | /* wthresh must be +1 more than desired */\ + (1 << 16) | /* wthresh must be +1 more than desired */\ (1 << 8) | /* hthresh */ \ 0x1f) /* pthresh */ diff --git a/drivers/net/ethernet/intel/e1000e/netdev.c b/drivers/net/ethernet/intel/e1000e/netdev.c index de57a2b..f444eb0 100644 --- a/drivers/net/ethernet/intel/e1000e/netdev.c +++ b/drivers/net/ethernet/intel/e1000e/netdev.c @@ -2831,7 +2831,7 @@ static void e1000_configure_tx(struct e1000_adapter *adapter) * set up some performance related parameters to encourage the * hardware to use the bus more efficiently in bursts, depends * on the tx_int_delay to be enabled, - * wthresh = 5 ==> burst write a cacheline (64 bytes) at a time + * wthresh = 1 ==> burst write is disabled to avoid Tx stalls * hthresh = 1 ==> prefetch when one or more available * pthresh = 0x1f ==> prefetch if internal cache 31 or less * BEWARE: this seems to work but should be considered first if -- 2.7.4