我的笔记本电脑遇到了严重的带宽问题，希望有人能帮助我解决这些问题。
Speedtest.net 通常报告我的下载速度约为 18 Mb，上传速度约为 2.5 Mb，ping 时间约为 20ms，当我遇到速度减慢时，速度分别为 ~ 1. ~1.5、70。这种速度减慢仅影响我的 Linux 安装，所有其他计算机和我的 Windows 分区功能正常。我的笔记本电脑是联想 Y570，运行 Ubuntu 12.10 和 3.9.0-030900rc6-generic 内核，以及 Windows 7。我之前在使用网络管理器时遇到过这个问题，后来改用 wicd，但测量结果没有任何改善
sudo lshw -c 网络
*-network
description: Ethernet interface
product: NetLink BCM57781 Gigabit Ethernet PCIe
vendor: Broadcom Corporation
physical id: 0
bus info: pci@0000:07:00.0
logical name: eth0
version: 10
serial: [REMOVED]
capacity: 1Gbit/s
width: 64 bits
clock: 33MHz
capabilities: pm msi msix pciexpress bus_master cap_list rom ethernet physical tp 10bt 10bt-fd 100bt 100bt-fd 1000bt 1000bt-fd autonegotiation
configuration: autonegotiation=on broadcast=yes driver=tg3 driverversion=3.130 firmware=sb latency=0 link=no multicast=yes port=twisted pair
resources: irq:16 memory:f1800000-f180ffff memory:f1810000-f181ffff memory:f1820000-f18207ff
*-network
description: Wireless interface
product: Centrino Wireless-N 1000
vendor: Intel Corporation
physical id: 0
bus info: pci@0000:08:00.0
logical name: wlan0
version: 00
serial: [REMOVED]
width: 64 bits
clock: 33MHz
capabilities: pm msi pciexpress bus_master cap_list ethernet physical wireless
configuration: broadcast=yes driver=iwlwifi driverversion=3.9.0-030900rc6-generic firmware=39.31.5.1 build 35138 ip=[REMOVED] latency=0 link=yes multicast=yes wireless=IEEE 802.11bg
resources: irq:58 memory:f1b00000-f1b01fff
命令lspci
00:00.0 Host bridge: Intel Corporation 2nd Generation Core Processor Family DRAM Controller (rev 09)
00:01.0 PCI bridge: Intel Corporation Xeon E3-1200/2nd Generation Core Processor Family PCI Express Root Port (rev 09)
00:02.0 VGA compatible controller: Intel Corporation 2nd Generation Core Processor Family Integrated Graphics Controller (rev 09)
00:16.0 Communication controller: Intel Corporation 6 Series/C200 Series Chipset Family MEI Controller #1 (rev 04)
00:1a.0 USB controller: Intel Corporation 6 Series/C200 Series Chipset Family USB Enhanced Host Controller #2 (rev 05)
00:1b.0 Audio device: Intel Corporation 6 Series/C200 Series Chipset Family High Definition Audio Controller (rev 05)
00:1c.0 PCI bridge: Intel Corporation 6 Series/C200 Series Chipset Family PCI Express Root Port 1 (rev b5)
00:1c.1 PCI bridge: Intel Corporation 6 Series/C200 Series Chipset Family PCI Express Root Port 2 (rev b5)
00:1c.3 PCI bridge: Intel Corporation 6 Series/C200 Series Chipset Family PCI Express Root Port 4 (rev b5)
00:1c.4 PCI bridge: Intel Corporation 6 Series/C200 Series Chipset Family PCI Express Root Port 5 (rev b5)
00:1d.0 USB controller: Intel Corporation 6 Series/C200 Series Chipset Family USB Enhanced Host Controller #1 (rev 05)
00:1f.0 ISA bridge: Intel Corporation HM65 Express Chipset Family LPC Controller (rev 05)
00:1f.2 SATA controller: Intel Corporation 6 Series/C200 Series Chipset Family 6 port SATA AHCI Controller (rev 05)
00:1f.3 SMBus: Intel Corporation 6 Series/C200 Series Chipset Family SMBus Controller (rev 05)
01:00.0 VGA compatible controller: NVIDIA Corporation GF108 [GeForce GT 555M] (rev ff)
07:00.0 Ethernet controller: Broadcom Corporation NetLink BCM57781 Gigabit Ethernet PCIe (rev 10)
08:00.0 Network controller: Intel Corporation Centrino Wireless-N 1000
09:00.0 USB controller: NEC Corporation uPD720200 USB 3.0 Host Controller (rev 04)
0a:00.0 System peripheral: JMicron Technology Corp. SD/MMC Host Controller (rev 30)
0a:00.2 SD Host controller: JMicron Technology Corp. Standard SD Host Controller (rev 30)
0a:00.3 System peripheral: JMicron Technology Corp. MS Host Controller (rev 30)
0a:00.4 System peripheral: JMicron Technology Corp. xD Host Controller (rev 30)
是否配置
eth0 Link encap:Ethernet HWaddr dc:0e:a1:85:79:65
UP BROADCAST MULTICAST MTU:1500 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:0 (0.0 B) TX bytes:0 (0.0 B)
Interrupt:16
lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
UP LOOPBACK RUNNING MTU:65536 Metric:1
RX packets:859 errors:0 dropped:0 overruns:0 frame:0
TX packets:859 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:176313 (176.3 KB) TX bytes:176313 (176.3 KB)
virbr0 Link encap:Ethernet HWaddr b6:24:f9:b9:3a:46
inet addr:192.168.122.1 Bcast:192.168.122.255 Mask:255.255.255.0
UP BROADCAST MULTICAST MTU:1500 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:0 (0.0 B) TX bytes:0 (0.0 B)
wlan0 Link encap:Ethernet HWaddr 74:e5:0b:e6:35:86
inet addr:192.168.1.66 Bcast:192.168.1.255 Mask:255.255.255.0
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:28652 errors:0 dropped:0 overruns:0 frame:0
TX packets:21186 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:29047155 (29.0 MB) TX bytes:14690621 (14.6 MB)
系统配置
eth0 no wireless extensions.
lo no wireless extensions.
virbr0 no wireless extensions.
wlan0 IEEE 802.11bg ESSID:"KendalAndBergman"
Mode:Managed Frequency:2.462 GHz Access Point: A8:39:44:4E:05:10
Bit Rate=11 Mb/s Tx-Power=14 dBm
Retry long limit:7 RTS thr:off Fragment thr:off
Power Management:off
Link Quality=70/70 Signal level=-34 dBm
Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0
Tx excessive retries:0 Invalid misc:741 Missed beacon:0
rfkill 列表
0: ideapad_wlan: Wireless LAN
Soft blocked: no
Hard blocked: no
1: ideapad_bluetooth: Bluetooth
Soft blocked: no
Hard blocked: no
3: phy1: Wireless LAN
Soft blocked: no
Hard blocked: no
我已经尝试过下面的命令，虽然它们做了一点改变（延迟更少，下载速率提高 1 mb），但我不确定这是否只是巧合。
sudo rmmod iwlwifi
sudo modprobe iwlwifi 11n_disable=1
任何帮助将非常感激！