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Date: Fri, 09 Sep 2011 10:33:58 +0900 From: "Jun.Kondo" <jun.kondo@...-g.co.jp> To: David Miller <davem@...emloft.net> Cc: linux-kernel@...r.kernel.org, omega-g1@...-g.co.jp, notsuki@...hat.com, motokazu.kozaki@...com, htaira@...hat.com, netdev@...r.kernel.org, tomohiko.takahashi@...-g.co.jp, kotaro.sakai@...-g.co.jp, ken.sugawara@...-g.co.jp Subject: Re: [omega-g1:11110] Re: [PATCH] net: configurable sysctl parameter "net.core.tcp_lowat" for sk_stream_min_wspace() The client of this system is cellular phone, and the status of the communication line with a client varies widely according to its place or congestion situation. In terms of the line speed, it can be around 9Mbps when it is fast, but 8kbps when it is slow. Requirement from customer is to provide stable service in both situation. - In normal situation, acquire large default transmission buffer value, and ensure high throughput from the beginning of tcp connection - On the other hand, even when the connection has low throughput, such as low rate streaming, transmit data without timeout However, when the throughput is low, it takes much time for the transmission buffer to be freed, and timeout will occur during that period. Of course, the connection will not be disconnected when the timeout of application is extended, but end user would not wait patiently as long as 1 minute. Therefore, we do not want to extend the timeout value. By making the threshold, which makes write possible after the buffer is blocked once, configurable, and set it to a small value, it will be possible to return data to client without making timeout occur. So, we think the issue can be solved with this modification. -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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