Date: Wed, 10 Nov 2021 23:35:35 -0500 From: Chris Ross <cross+freebsd@distal.com> To: freebsd-stable@freebsd.org Subject: swap_pager: cannot allocate bio Message-ID: <9FE99EEF-37C5-43D1-AC9D-17F3EDA19606@distal.com>
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Hey all. I have a system that I’m trying to do some intensive CPU and I/O on. FreeBSD 13.0-RELEASE, amd64, 128GB RAM, hardware RAID1 OS volume, and a large (40TB) zpool where most of the I/O is happening.
Initially, it was failing for me because it was running out of swap space. It had only the normal small (4-8G) swap partition, so I resized the filesystems on the root disk and now have 400+GB swap. The system had frozen up and I wasn’t able to log in. When I go to the console, I find a long list of:
swap_pager: cannot allocate bio
lines. I was able to log into the console as root and pstat -s shows the swap minimally used (7.5GB used). Attempting a “zpool status” at that point locked up. I don’t know if the problem is the memory subsystem, or zfs.
But, based on the error, is there perhaps some kernel parameter I can tune that might prevent the swap pager from encountering that error?
- Chris
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