ENOMEM in swap_pager

[Ivan Voras]

On a P3 server with 1GB of memory, every now and then (about twice a 
month) I get a log full of errors like this:

swap_pager: I/O error - pageout failed; blkno 167,size 4096, error 12
swap_pager: I/O error - pageout failed; blkno 182,size 4096, error 12
swap_pager: I/O error - pageout failed; blkno 199,size 8192, error 12
swap_pager: I/O error - pageout failed; blkno 12456,size 20480, error 12
swap_pager: I/O error - pageout failed; blkno 222,size 8192, error 12

The server runs fine otherwise, and it doesn't seem to affect applications 
in any way I'm able to detect. It's running latest 5.4-RELEASE, swap is 
on a SCSI disk, single processor.

IIRC GEOM should handle ENOMEMs by retrying the IO, but I'm asking just in 
case - are these errors something I should worry about?


-- 
Every sufficiently advanced magic is indistinguishable from technology
    - Arthur C Anticlarke