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

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Message-Id: <20151005.033024.2236659260552514725.davem@davemloft.net>
Date:	Mon, 05 Oct 2015 03:30:24 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	santosh.shilimkar@...cle.com
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

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.

Thanks.
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