[DragonFlyBSD - Bug #1806] (Closed) DFBSD 2.7.3 - mbuf exhausted while rsync to a NFS

[bugtracker-admin at leaf.dragonflybsd.org]

Issue #1806 has been updated by tuxillo.

Status changed from New to Closed
% Done changed from 0 to 100

Unable to reproduce this issue, hence closing.

h3. Evidence

*SERVER*

<pre>
root at dev01:/usr/src # sysctl hw.physmem 
hw.physmem: 500301824

root at dev01:/usr/src # cat /etc/exports  
/usr -alldirs -maproot=root: -network 10.0.0.0/24

</pre>

* Have been monitoring the mbuf usage, it's really low during the copy.
* No errors in dmesg.


*CLIENT*

<pre>
root at dev03:~ # df -h /usr/src 
Filesystem            Size   Used  Avail Capacity  Mounted on
10.0.0.101:/usr/src  44.5G  11.0G  33.5G    25q    /usr/src

root at dev03:~ # rsync -aP --delete /usr/src /mnt/target/usr/ 
sending incremental file list

root at dev03:~ # diff -urN /usr/src /mnt/target/usr/src
load: 0.00  cmd: diff 798 [running] 0.08u 1.36s 7q 3916k
root at dev03:~ #  

</pre>

* Repeated the copy multiple times.
* Even compared the directories with diff and rsync.

----------------------------------------
Bug #1806: DFBSD 2.7.3 - mbuf exhausted while rsync to a NFS
http://bugs.dragonflybsd.org/issues/1806#change-14268

* Author: tuxillo
* Status: Closed
* Priority: Normal
* Target version: 6.4
----------------------------------------
I got two virtual machines running DFBSD. One is KVM (512MB mem) and the other
one is under VMware (1024MB).

kvm is the NFS server which is exporting /usr like this:
@/usr -alldirs -maproot=root: -network ....@

>From the vmware I mount it, and start copying the repo using rsync:

@# rsync -av -progress /usr/src /mnt/target/usr/@

After a while the following warning appears in the kvm (NFS server):
Warning, objcache(mbuf): Exhausted!

<pre>
# netstat -m
9056/9056 mbufs in use (current/max):
134/4528 mbuf clusters in use (current/max)
          9190 mbufs and mbuf clusters allocated to data
2532 Kbytes allocated to network (22% of mb_map in use)
163 requests for memory denied
0 requests for memory delayed
0 calls to protocol drain routines
</pre>


In the client part the copy stops:

<pre>
dfbsd/.git/objects/pack/pack-eb16b18282ea58f39f353cb1c7e4786cfa544159.pack
    24084480  10%    4.10MB/s    0:00:48
rsync: writefd_unbuffered failed to write 4 bytes to socket [sender]: Broken
pipe (32)
rsync: write failed on
"/mnt/remote/dfbsd/.git/objects/pack/pack-eb16b18282ea58f39f353cb1c7e4786cfa544159.pack":
RPC struct is bad (72)
rsync error: error in file IO (code 11) at receiver.c(302) [receiver=3.0.7]
[sender] io timeout after 30 seconds -- exiting
rsync error: timeout in data send/receive (code 30) at io.c(140) [sender=3.0.7]
[vmware] /usr/src>
</pre> 

And I can't even ssh from outside the kvm machine:
<pre>
% ssh 192.168.3.100
antonioh at 192.168.3.100's password: 
Timeout, server not responding.
%
</pre>



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