Insanely high RAM *buffers* usage following reboot/resize
Data that munin is displaying is corroborated by the output of "free":
[[email protected] ~]$ free -m total used free shared buffers cached Mem: 11967 9371 2595 0 7367 542 -/+ buffers/cache: 1462 10504 Swap: 255 0 255
Now, I'm well aware of the kernel's usage of unused memory for cache, but my understanding of buffers is that buffers are used to temporarily store writes until they've been committed to disk. Is that a correct understanding?
Now, three things (that I know of) changed during the migration.
1) We picked up the extra 4 cores that were given out earlier this week.
2) We're on the "Latest 64 bit" kernel, which is now 3.7.10-x86_64-linode30. Previously we were on 3.0.18 I believe.
3) We went from 4GB RAM to 12GB.
So…any thoughts about this? I can't make heads nor tails of it. This is a webserver, with very little disk IO (database is hosted elsewhere). I could see high buffer usage on a server with very high write IO, but I can't explain this in our case.~~
Network traffic hasn't changed significantly: