Thank you for your precisions :)
On Mon 25 Jan 2021 10:15:00 GMT, Maria Matejka wrote: > Hello! > > My first thought would be that BIRD called free() on that memory, not > necessarily returning the memory back to the kernel. > > This may change in some new versions with changing at least some of the > memory allocations to mmap/munmap. This should help a lot with this > specific problem, anyway it is not going to happen in the next version. > > It may also sometimes be possible to run reconfiguration several times > to trigger the LibC's internal memory release algorithms, anyway all of > this magic is mostly just a cargo cult. > > Maria > > On 1/25/21 8:08 AM, Alarig Le Lay wrote: > > Hi, > > > > On one of my routers, I needed to free some RAM temporally, so I shut > > all my BGP sessions. With `birdc show memory` I saw that it should have > > worked, however htop was still seeing 1.2G used by bird. > > > > 5311 root 20 0 1296M 1220M 1724 S 0.0 61.1 59h01:29 ├─ > > /usr/sbin/bird -s /run/bird.ctl -c /etc/bird.conf - > > 5314 root 20 0 1296M 1220M 1724 S 0.7 61.1 6h31:09 │ └─ > > /usr/sbin/bird -s /run/bird.ctl -c /etc/bird.con > > > > bird> show memory > > BIRD memory usage > > Routing tables: 49 MB > > Route attributes: 842 kB > > Protocols: 300 kB > > Total: 50 MB > > > > > > So, I added the `disabled` option to my sessions and restarted bird, and > > then birdc and htop were almost consistent. > > > > 25724 root 20 0 107M 32600 2224 S 0.7 1.6 0:00.62 ├─ > > /usr/sbin/bird -s /run/bird.ctl -c /etc/bird.conf - > > 25726 root 20 0 107M 32600 2224 S 0.7 1.6 0:00.16 │ └─ > > /usr/sbin/bird -s /run/bird.ctl -c /etc/bird.con > > > > bird> show memory > > BIRD memory usage > > Routing tables: 28 MB > > Route attributes: 46 kB > > Protocols: 304 kB > > Total: 29 MB > > > > > > When I re-enabled the BGP sessions, the RAM utilisation was a bit lower > > (the original process was two months old). > > > > 25724 root 20 0 1147M 1072M 2072 R 1.3 53.7 2:33.80 ├─ > > /usr/sbin/bird -s /run/bird.ctl -c /etc/bird.conf - > > 25726 root 20 0 1147M 1072M 2072 S 0.7 53.7 0:07.84 │ └─ > > /usr/sbin/bird -s /run/bird.ctl -c /etc/bird.con > > > > bird> show memory > > BIRD memory usage > > Routing tables: 399 MB > > Route attributes: 528 MB > > Protocols: 102 MB > > Total: 1029 MB > > > > Perhaps bird thinks that some RAM has been freed while it’s not actually > > the case? > >
