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vm: Use "cache=loose" for all 9p mounts. 

This significantly improves read throughput when running things like
"guix hash -r ...".

* gnu/system/vm.scm (%linux-vm-file-systems): Add 'flags' for "store".
Add "cache=loose" to every file system.
This commit is contained in:
Ludovic Courtès 2018-09-23 23:31:52 +02:00
parent b5460d95e9
commit fce2254711
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1 changed files with 10 additions and 3 deletions
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13
gnu/system/vm.scm
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@ -99,21 +99,28 @@
(device "store")
(type "9p")
(needed-for-boot? #t)
(options "trans=virtio")
(flags '(read-only))
(options "trans=virtio,cache=loose")
(check? #f))
;; The 9p documentation says that cache=loose is "intended for
;; exclusive, read-only mounts", without additional details. In
;; practice it seems to work well for these, and it's much faster than
;; the default cache=none, especially when copying and registering
;; store items.
(file-system
(mount-point "/xchg")
(device "xchg")
(type "9p")
(needed-for-boot? #t)
(options "trans=virtio")
(options "trans=virtio,cache=loose")
(check? #f))
(file-system
(mount-point "/tmp")
(device "tmp")
(type "9p")
(needed-for-boot? #t)
(options "trans=virtio")
(options "trans=virtio,cache=loose")
(check? #f))))
(define not-config?