Yo Derek! Fancy meeting you here. I will look you up later.
Derek Atkins wrote: > There's another problem. The wireless extensions have a size limit > for the scan results data. The buffer size is a u16, which means you're > limited to 65535 bytes. The network manager buffer increase algorithm > keeps doubling the buffer size, so you get 2k, 4k, 8k, 16k, 32k, 64k.. > but 64k mod 2^16 == 0! Meaning you never actually get to try a full 64k > buffer. > > A workaround to this issue is to change the NM code to max out at > 65535 instead of 65536 or "100000" (which is the current limit).. > > This is being a MAJOR problem to a bunch of us at the IETF because > we can easily hear well over 100 APs most of the time. Please! We are use to seeing some of the worst-case work environments with too many APs and SSIDs for most code to cope with. > Quoting Dan Williams <[EMAIL PROTECTED]>: > >> On Mon, 2008-03-10 at 23:40 -0400, Robert Moskowitz wrote: >>> Ver 0.6.4 in Centos 5.1 >>> >>> I am seeing 17 SSIDs in the current list. But I am not seeing one that >>> I expected to see. And some of the listed SSIDs are 'stale'; that is >>> they were visible in the part of the hotel I was in a couple minutes >>> ago, but not in this part. So I guess a second question is how do you >>> force a scan to produce a current SSID list? >> >> You don't force a scan. NetworkManager will periodically scan with a >> backoff algorithm; it will start at 20 seconds and back off to 2 >> minutes. APs are kept in the scan list for a maximum of 6 minutes >> before being culled. >> >> The problem is that wireless is hard, and sometimes cards/drivers miss >> beacons. Often they will not report all the APs that are known to be >> around at a given time. So NetworkManager takes a composite of the last >> few scans as the scan list. >> >> 0.6.x also combines APs with the same SSID in the UI. 0.7 splits them >> out at the NetworkManager layer, while the applet combines APs that are >> similar based on more than just SSID (SSID, security settings, band, >> channel). >> >>> Perhaps the question may be how many APs can be handled and then those >>> are turned into the SSID list (when more than one AP per SSID is found >>> as in the case of some of these SSIDs). >> >> Are any of the APs hidden? >> > _______________________________________________ NetworkManager-list mailing list [email protected] http://mail.gnome.org/mailman/listinfo/networkmanager-list
