linux-kernel - Re: [PATCH v2 05/14] RDS: defer the over

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Message-ID: <561297B4.8000403@oracle.com>
Date:	Mon, 5 Oct 2015 08:31:00 -0700
From:	santosh shilimkar <santosh.shilimkar@...cle.com>
To:	David Miller <davem@...emloft.net>
Cc:	netdev@...r.kernel.org, linux-rdma@...r.kernel.org,
	linux-kernel@...r.kernel.org, ssantosh@...nel.org
Subject: Re: [PATCH v2 05/14] RDS: defer the over_batch work to send worker

On 10/5/2015 3:30 AM, David Miller wrote:
> From: Santosh Shilimkar <santosh.shilimkar@...cle.com>
> Date: Wed, 30 Sep 2015 13:24:24 -0400
>
>> @@ -423,7 +423,9 @@ over_batch:
>>   		     !list_empty(&conn->c_send_queue)) &&
>>   		    send_gen == conn->c_send_gen) {
>>   			rds_stats_inc(s_send_lock_queue_raced);
>> -			goto restart;
>> +			if (batch_count < 1024)
>> +				goto restart;
>> +			queue_delayed_work(rds_wq, &conn->c_send_w, 1);
>
> Sorry, you can't just use a magic number like this.
>
> You have to describe, in detail, exactly how this value was
> choosen, derived, and tested to be effeective and in exactly
> what environment those tests were done.
>
> You must also use a mnenomic for this value rather than a
> raw magic constant.
>
Right. Infact If I look at it now again, there is already a batch
count parameter which is module parameter. I will use that in
this hunk as well as the other couple places and send an update.

Thanks for review !!

Regards,
Santosh
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