Git push slowly under 1000M/s network

> Hi Git Listeners,
> I'm facing one problem when pushing to git repository via gerrit port.
> Don't stop to look into the below content, as I doubt it might be a
> git problem.
>
> The pushing takes me 7mins~11mins each time every I had git gc on remote.
> The remote server is 24 core with scsi disk. And the connection is
> within 1000M/s intranet.
> The pushing is only slowly on this kernel project, but faster on other
> android projects, takes seconds only.
> I tried on 4 core and 24 core clients to do the push, the time is
> almost the same. So I think it's not the client problem.
>
> The command I use as below. I also tried to pushing to git repository
> directly, it is also slow, only some seconds benifit. So I think it
> might be not the gerrit problem.
> $ git push -v ssh://remote_url:29418/kernel/msm.git HEAD:refs/changes/33599
> The stderr stops at remote: Resolving deltas:   0% (0/2) for 99% of the time.
>
> I added some timestamp in the git source code, Like git version 1.8.0.
> The receive_status called by send_pack inside send-pack.c takes the
> 99% of the time.
>
> It looks like the client is waiting the pushing result status from
> server although by checking server side, the real object has already
> been upload succeed.
>
> Below is the log after adding time info.
> $ time git push -v ssh://git.qrd.qualcomm.com:29418/kernel/msm.git
> HEAD:refs/changes/33599 2>&1|tee -a log.txt
> Pushing to ssh://git.qrd.qualcomm.com:29418/kernel/msm.git
> error: Time start packet_flush: Tue Oct 23 14:14:47 2012
>
> error: Time finish packet_trace: Tue Oct 23 14:14:47 2012
>
> error: Time finish safe_write: Tue Oct 23 14:14:47 2012
>
> error: Time start receive_status: Tue Oct 23 14:14:47 2012
>
> remote: Resolving deltas:   0% (0/2)
> remote: (W) afafdad: no files changed, message updated
> error: Time start packet_read_line: Tue Oct 23 14:24:41 2012
> , len=10
> error: Time packet_read_line: Tue Oct 23 14:24:41 2012
> , len=22
> error: Time packet_read_line: Tue Oct 23 14:24:41 2012
> , len=0
> error: Time finish receive_status: Tue Oct 23 14:24:41 2012
>
> To ssh://git.qrd.qualcomm.com:29418/kernel/msm.git
>  * [new branch]      HEAD -> refs/changes/33599
>
> real    9m56.928s
> user    0m0.364s
> sys     0m0.160s
> --
> -Joey Jiao

> It looks like the client is waiting the pushing result status from
> server although by checking server side, the real object has already
> been upload succeed.
>
> Below is the log after adding time info.
> $ time git push -v ssh://git.qrd.qualcomm.com:29418/kernel/msm.git
> HEAD:refs/changes/33599 2>&1|tee -a log.txt

> On Mon, Oct 22, 2012 at 11:27 PM, Joey Jiao <joey.jiaojg@gmail.com> wrote:
>> It looks like the client is waiting the pushing result status from
>> server although by checking server side, the real object has already
>> been upload succeed.
>>
>> Below is the log after adding time info.
>> $ time git push -v ssh://git.qrd.qualcomm.com:29418/kernel/msm.git
>> HEAD:refs/changes/33599 2>&1|tee -a log.txt
> ...
>> remote: Resolving deltas:   0% (0/2)
>> remote: (W) afafdad: no files changed, message updated
> ...
>> real    9m56.928s
>> user    0m0.364s
>> sys     0m0.160s
>
> What version of Gerrit are you using?
> How many changes already exist in this project?
>
> I am fairly certain this is an issue with Gerrit. Which may be better
> discussed at http://groups.google.com/group/repo-discuss