I experience this problem on my Dell Vostro 3700 laptop, which is Ubuntu
certified for 10.10 64 bit (though I am running the 32 bit version of
10.10). Like coclocotero, I see ping round trips to a local system of
hundreds of milliseconds, making the system unusable for ssh sessions.
The problem can be fixed by switching power management off as follows:
sudo iwconfig eth1 power off
(If your wireless connection was up when you did this, then you have to
disconnect it, then re-connect in order to see the benefit).
After this, ping round trips are uniformly 1 to 2 ms and wireless
performance is acceptable.
I haven't found a suitable location in startup scripts to place the
iwconfig call; placing it in rc.local did not work (probably the
wireless kernel modules aren't loaded when rc.local is executed - my
networking is set to "on-demand-started-by-the-user" rather than "at
boot"). Haven't time to fix this for now; I'll try modprobing the
wireless kernel modules the next time I look at it.
I hope this information is useful - I found it on an Ubuntu forum post.
p.s. lspci -vv tells me this:
12:00.0 Network controller: Broadcom Corporation BCM43224 802.11a/b/g/n (rev 01)
Subsystem: Dell Device 000e
Physical Slot: 0-1
Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr-
Stepping- SERR- FastB2B- DisINTx-
Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort-
<MAbort- >SERR- <PERR- INTx-
Latency: 0, Cache Line Size: 64 bytes
Interrupt: pin A routed to IRQ 17
Region 0: Memory at fb400000 (64-bit, non-prefetchable) [size=16K]
Capabilities: <access denied>
Kernel driver in use: wl
Kernel modules: wl
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https://bugs.launchpad.net/bugs/696457
Title:
Unstable latency and packet loss in broadcom bcm43224 wireless driver
(broadcom sta driver)
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