Bug#400524: net-r8169-1.patch decrease realtek network performance on debian 2.6.18
Package: linux-image-2.6.18-3-amd64
Version: 2.6.18-6
Hello,
I noticed that patching a vanilla kernel with debian patch
net-r8169-1.patch decrease speed of my realtek network card
(precise location of patch
kernel-patches/all/2.6.18/debian/features/all/drivers/net-r8169-1.patch.bz2)
I first noticed problems trying to tune my network with 2.6.16 and
2.6.18 kernels. Making more tests i discovered speed problem with 2.6.18
packages
vanilla 2.6.16.29 and debian 2.6.17-2 give me 650Mbps
vanilla 2.6.18.3 give me 650Mbps
debian 2.6.18-3 give me 280Mbps
vanilla 2.6.18.3 with net-r8169-1.patch applied give me 280Mbps
(tests are done with iperf, both tcp and udp give similar results)
to reproduce :
- Build and install a vanilla 2.6.18.3 using config from debian package
- make network tests --> 650Mbps
- apply net-r8169-1.patch to network source
- make modules, make modules_install
- ifdown eth2, rmmmod r8169, modprobe r8169, ifup eth2
- make network tests --> 280Mbps
- To be sure, revert to original r8169 and re-test --> 650Mpbs
The machine is an Athlon64 with nforce430 chipset and realtek pci
network card
lspci -n for realtek card : 01:06.0 0200: 10ec:8169 (rev 10)
full lspci :
00:00.0 RAM memory: nVidia Corporation C51 Host Bridge (rev a2)
00:00.1 RAM memory: nVidia Corporation C51 Memory Controller 0 (rev a2)
00:00.2 RAM memory: nVidia Corporation C51 Memory Controller 1 (rev a2)
00:00.3 RAM memory: nVidia Corporation C51 Memory Controller 5 (rev a2)
00:00.4 RAM memory: nVidia Corporation C51 Memory Controller 4 (rev a2)
00:00.5 RAM memory: nVidia Corporation C51 Host Bridge (rev a2)
00:00.6 RAM memory: nVidia Corporation C51 Memory Controller 3 (rev a2)
00:00.7 RAM memory: nVidia Corporation C51 Memory Controller 2 (rev a2)
00:02.0 PCI bridge: nVidia Corporation C51 PCI Express Bridge (rev a1)
00:03.0 PCI bridge: nVidia Corporation C51 PCI Express Bridge (rev a1)
00:04.0 PCI bridge: nVidia Corporation C51 PCI Express Bridge (rev a1)
00:05.0 VGA compatible controller: nVidia Corporation C51G [GeForce
6100] (rev a2)
00:09.0 RAM memory: nVidia Corporation MCP51 Host Bridge (rev a2)
00:0a.0 ISA bridge: nVidia Corporation MCP51 LPC Bridge (rev a2)
00:0a.1 SMBus: nVidia Corporation MCP51 SMBus (rev a2)
00:0a.2 RAM memory: nVidia Corporation MCP51 Memory Controller 0 (rev
a2)
00:0b.0 USB Controller: nVidia Corporation MCP51 USB Controller (rev a2)
00:0b.1 USB Controller: nVidia Corporation MCP51 USB Controller (rev a2)
00:0d.0 IDE interface: nVidia Corporation MCP51 IDE (rev a1)
00:0e.0 IDE interface: nVidia Corporation MCP51 Serial ATA Controller
(rev a1)
00:0f.0 IDE interface: nVidia Corporation MCP51 Serial ATA Controller
(rev a1)
00:10.0 PCI bridge: nVidia Corporation MCP51 PCI Bridge (rev a2)
00:10.1 Audio device: nVidia Corporation MCP51 High Definition Audio
(rev a2)
00:14.0 Bridge: nVidia Corporation MCP51 Ethernet Controller (rev a1)
00:18.0 Host bridge: Advanced Micro Devices [AMD] K8 [Athlon64/Opteron]
HyperTransport Technology Configuration
00:18.1 Host bridge: Advanced Micro Devices [AMD] K8 [Athlon64/Opteron]
Address Map
00:18.2 Host bridge: Advanced Micro Devices [AMD] K8 [Athlon64/Opteron]
DRAM Controller
00:18.3 Host bridge: Advanced Micro Devices [AMD] K8 [Athlon64/Opteron]
Miscellaneous Control
01:06.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL-8169
Gigabit Ethernet (rev 10)
01:07.0 Ethernet controller: Intel Corporation 82540EM Gigabit Ethernet
Controller (rev 02)
01:0e.0 FireWire (IEEE 1394): VIA Technologies, Inc. IEEE 1394 Host
Controller (rev 80)
dmesg after loading vanilla module:
r8169 Gigabit Ethernet driver 2.2LK-NAPI loaded
ACPI: PCI Interrupt 0000:01:06.0[A] -> Link [APC1] -> GSI 16 (level,
low) -> IRQ 217
eth2: Identified chip type is 'RTL8169s/8110s'.
eth2: RTL8169 at 0xffffc20000028000, 00:e0:4c:31:7d:2d, IRQ 217
dmesg after loading patched module:
r8169 Gigabit Ethernet driver 2.2LK-NAPI loaded
ACPI: PCI Interrupt 0000:01:06.0[A] -> Link [APC1] -> GSI 16 (level,
low) -> IRQ 217
eth2: RTL8169s/8110s at 0xffffc20000028000, 00:e0:4c:31:7d:2d, IRQ 21
--
Huf <hugues.freville@worldonline.fr>
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