On 2010-11-01 8:30, Andriy Gapon wrote:
First and foremost, the double-caching issue for ZFS+sendfile on FreeBSD is
still there and no resolution for this issue is on horizon. So, you have to
account for the fact that twice as much memory is needed for this use-case.
Whether you plan your system, or configure it, or tune it.
Second, with recent head and stable/8 ARC should not be the primary victim of
memory pressure; ARC reclaim thread and the page daemon should cooperate in
freeing/recycling memory.
Nothing much to add.
Although this discussion started due to issues with serving files thru
web-typish services, there are more apps that use sendfile.
For one, I noticed that I had once enabled sendfile in my Samba config.
As per this discussion I saw little advantage in keeping it that way......
But I'm open for other suggestions.
--WjW
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