Hi Ben, Thanks for the feedback. That's strange, although has logic.
Even more strage is that your device has 32MB of Ram so it should be able to be handling things well. Can you compile the trunk (Barrier Breaker) and test with it on the same device to find out if it will behavior the same way ? Perhaps the problem is somewhere else or something specific to the way zram works on kernel 3.3 like Hauke mentioned in a earlier email. Regards, Fernando On 8 November 2013 05:40, Ben West <b...@gowasabi.net> wrote: > As someone who runs AA r38247 patched to include zram support, I can add > anecdotal experience that some processes don't behave well when paged to > swap. I'm running AR7240 devices with 32MB RAM (i.e. UBNT M gear) as mesh > nodes, and I've found that services like olsrd, coovachilli, and > wpa_supplicant seem to behave erratically if they're swapped out and then > back in. For this reason, I only enable 3MBytes of swap, preferring not to > depend on it for normal operation. Only enough so that a node can detect > when it's in a low-memory state and do something to recover (e.g. reboot). > > I've not had opportunity to test whether this problem also happens with > the newer kernel under BB. > > > On Thu, Nov 7, 2013 at 4:10 PM, Hauke Mehrtens <ha...@hauke-m.de> wrote: > >> On 11/07/2013 12:08 AM, Fernando Frediani wrote: >> > Hi Hauke, >> > >> > What you mean by zram worked differently ? As far as I know zram >> > (previously known as compcache) has been merged to the Linux Kernel at >> > 3.2 so it should be there on 3.3 as well (check drivers/staging/zram). >> >> In Kernel 3.3 zram depends on XVMALLOC being build into the kernel, but >> in OpenWrt our plan was to build zram completely in a module so if >> someone does not want it nothing changes. >> >> > I have talked to Bastien in another conversation and he mentioned he has >> > a WRT54G running fine with Barrier Breaker (which has zram as a kmod >> > package), but not sure it's enabled by default or not. I'm interested to >> > to hear if it's having any improvements (how effective the swap zram is >> > being used) and if it is a stripped down build (no LuCI and other >> > packages) or a normal build. Also how big the swap zram should be ? 6MB >> > (as kalua script suggests) or 8MB (half of the memory) ? >> >> Yes Bastien made the patch which introduced zram support. If you want >> that in AA, it should be possible to make it also build as a kernel >> module. When it is there you can try out what is the best size. >> >> > I have seen a couple of people saying they have managed to flash >> > brcm47xx Attitude Adjustment to WRT54G routers but got instability >> > issues (slowness or disconnects). >> >> Yes flashing works, it just runs out of memory very often and the OOM >> killer starts to kill processes. >> >> > So if Barrier Breaker is working fine on WRT54G (with zram activated?) >> > then what would be the challenges to port that work already done back to >> > Attitude Adjustment ? >> >> I do not know if it works fine on these devices, but if it does with >> some traffic going over the router over some time then we should try to >> backport zram support. >> >> > >> > Best regards, >> > >> > Fernando >> > >> > >> > On 6 November 2013 18:17, Hauke Mehrtens <ha...@hauke-m.de >> > <mailto:ha...@hauke-m.de>> wrote: >> > >> > On 11/06/2013 05:15 PM, Fernando Frediani wrote: >> > > Hello Hauke, >> > > >> > > I have seen a few emails from you on openwrt-devel list about the >> > zram module and also saw it is already present on the trunk(Barrier >> > Breaker). >> > > >> > > Was wondering if there is any work going on or will be to backport >> > it to Attitude Adjustment then perhaps we can run it on the good and >> > old WRT54G and similar models with 16MB ? How difficult is it to >> > backport to AA as it is already done for trunk ? >> > > >> > > >> > > Thanks and best regards, >> > > >> > > Fernando >> > > >> > Hi Fernando, >> > >> > I have no plan to backport zram to Attitude Adjustment. Attitude >> > Adjustment uses kernel 3.3 and there zram worked differently or was >> not >> > included at all, I do not know exactly. But I would like to see zram >> > backported to AA and would like to see a nice patch. >> > >> > Hauke >> > >> > >> _______________________________________________ >> openwrt-devel mailing list >> openwrt-devel@lists.openwrt.org >> https://lists.openwrt.org/cgi-bin/mailman/listinfo/openwrt-devel >> > > > > -- > Ben West > http://gowasabi.net > b...@gowasabi.net > 314-246-9434 >
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