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List:       fuse-devel
Subject:    Re: [fuse-devel] [fuse] Unexpectedly large number of getattr() and lookup requests
From:       Miklos Szeredi <miklos () szeredi ! hu>
Date:       2018-11-30 7:58:33
Message-ID: CAJfpegvQRmm2bbrrcm=bU5eKYgRoaKirtvfid7PG+=k41Oi+2A () mail ! gmail ! com
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On Thu, Nov 29, 2018 at 10:20 PM Nikolaus Rath <Nikolaus@rath.org> wrote:
>
> Hello,
>
> I am seeing an unexpectedly large number of getattr() and lookup()
> requests being sent to userspace fuse. I am setting a very large
> attr_timeout and entry_timeout, so I would have expected that the
> maximum number of getattr() and lookup() requests is capped by the
> number of distinct files in the filesystem plus the number of forget
> requests.
>
> However, actual numbers are much higher. For example, when running tests
> on a filesystem with 2960 directory entries, I am getting scenarios
> with 203447 lookup requests, 12970 getattr requests, and zero forget
> requests.
>
> Did I misunderstand something about how dentry and attribute caching
> works?

Debug log might be useful.

Thanks,
Miklos


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