[Dovecot] Slow header fetching rate over nfs mailspool.

[Dino Ming]

Hi Timo,

I did a test with manully perform ls a hunderd times on the
/dap/mstorage/example.com/dino/Maildir/cur

but the response is very fast and without the strange delay like  
inside dovecot.

With 558 emails inside the cur directory. The time to execute the ls  
is just

real	0m0.061s
user	0m0.008s
sys	0m0.008s

Regards,
Dino

On 24 Jan 2008, at 1:39 AM, Timo Sirainen wrote:

> On Thu, 2008-01-24 at 00:18 +0800, Dino Ming wrote:
>> open("/dap/mstorage/example.com/dino/Maildir/cur", O_RDONLY|
>> O_NONBLOCK|O_DIRECTORY) = 8 <0.000098>
> ..
>> getdents64(8, /* 114 entries */, 8192)  = 8128 <0.347680>
>> getdents64(8, /* 113 entries */, 8192)  = 8136 <1.385329>
>> getdents64(8, /* 113 entries */, 8192)  = 8144 <1.668419>
>> getdents64(8, /* 113 entries */, 8192)  = 8136 <2.942874>
>> getdents64(8, /* 107 entries */, 8192)  = 7712 <5.346971>
>> getdents64(8, /* 0 entries */, 8192)    = 0 <0.000046>
>
> This means that a simple "ls" call on that cur directory would take
> about 11 seconds (when the directory entries aren't already cached).  
> You
> could verify that this happens.
>
> So I can't really say anything else than that the problem is somewhere
> outside Dovecot..
>