netdev - Re: NAPI, rx_no_buffer_count, e1000, r8169 and other actors

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Date:	Mon, 16 Jun 2008 00:32:17 +0300
From:	"Denys Fedoryshchenko" <denys@...p.net.lb>
To:	Francois Romieu <romieu@...zoreil.com>
Cc:	netdev@...r.kernel.org
Subject: Re: NAPI, rx_no_buffer_count, e1000, r8169 and other actors

On Sun, 15 Jun 2008 22:57:10 +0200, Francois Romieu wrote
> Denys Fedoryshchenko <denys@...p.net.lb> :
> [...]
> > Third host r8169 (PCI! This is important, seems i am running out of PCI
> > capacity), 400Mbit/s rx+tx summary load, e1000e interface also - around
> 
> 400 rx + 400 tx or 200 rx + 200 tx ?
> Can you specify the packet rate and the cpu ?

On this host 275 Mbps TX right now, 152 Mbps RX.
After 3 minute uptime
eth0      Link encap:Ethernet  HWaddr 00:18:F8:0B:46:A6
          inet addr:192.168.20.10  Bcast:0.0.0.0  Mask:255.255.255.0
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:9510755 errors:0 dropped:400 overruns:0 frame:0
          TX packets:9601889 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:10000
          RX bytes:3768549053 (3.5 GiB)  TX bytes:2251698126 (2.0 GiB)
          Interrupt:21 Base address:0x4000

MegaRouter-KARAM ~ # ethtool -S eth0
NIC statistics:
     tx_packets: 10336831
     rx_packets: 10191781
     tx_errors: 0
     rx_errors: 0
     rx_missed: 436
     align_errors: 0
     tx_single_collisions: 0
     tx_multi_collisions: 0
     unicast: 10183249
     broadcast: 971
     multicast: 7561
     tx_aborted: 0
     tx_underrun: 0

MegaRouter-KARAM ~ # mpstat -P ALL 1
Linux 2.6.26-rc6-git2-build-0029 (MegaRouter-KARAM)     06/16/08

00:32:08     CPU   %user   %nice    %sys %iowait    %irq   %soft  %steal  
%idle    intr/s
00:32:09     all    0.50    0.00    1.49    0.00    1.49   27.23    0.00  
69.31  76659.41
00:32:09       0    1.01    0.00    0.00    0.00    0.00   43.43    0.00  
55.56  61549.50
00:32:09       1    0.00    0.00    1.98    0.00    2.97   10.89    0.00  
84.16  15102.97
00:32:09       2    0.00    0.00    0.00    0.00    0.00    0.00    0.00   
0.00      0.00



> 
> > 200Mbps load. What is worrying me - interrupts rate, it seems generated by
> > realtek card... is there any way to drop it down? 
> >
> > Also some packetloss, around 0.0005% (i prefer to have clear zero :-)) ). No
> > nat, no shapers, same kernel configuration.
> 
> Can you send an ethtool -S (+ ifconfig) of the 8169 if it misses 
> packets as well as the lines of dmesg which relate to the r8169 
> driver ?
> 
> -- 
> Ueimor
> --
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--
Denys Fedoryshchenko
Technical Manager
Virtual ISP S.A.L.

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