netdev - r8169 tx problem (1s pause with ping)

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Date:	Tue, 12 Jun 2007 20:41:54 -0400
From:	Benjamin LaHaise <bcrl@...ck.org>
To:	netdev@...r.kernel.org
Subject: r8169 tx problem (1s pause with ping)

Hello folks,

I'm seeing something odd with r8169 on FC7: doing a ping -s 1600 alternates 
between a 1s latency and sub 1ms.  Has anyone else seen anything like this?  
The system in question is an Asus M2A-VM with an onboard RTL8111 (I think).  
NAPI doesn't seem to make a difference.  The kernel in question is currently 
a vanilla 2.6.21.5.  Sub-mtu sized packets behave normally.

02:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8111/8168B PCI Express Gigabit Ethernet controller (rev 01)

PING 1.2.3.4 (1.2.3.4) 1600(1628) bytes of data.
1608 bytes from 1.2.3.4: icmp_seq=1 ttl=64 time=1000 ms
1608 bytes from 1.2.3.4: icmp_seq=2 ttl=64 time=0.816 ms
1608 bytes from 1.2.3.4: icmp_seq=3 ttl=64 time=1000 ms
1608 bytes from 1.2.3.4: icmp_seq=4 ttl=64 time=0.661 ms

		-ben
-- 
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