Date: Tue, 13 Aug 2013 17:58:36 -0700 From: Navdeep Parhar <np@FreeBSD.org> To: Julian Elischer <julian@freebsd.org> Cc: FreeBSD Net <net@FreeBSD.org> Subject: Re: TSO and FreeBSD vs Linux Message-ID: <520AD63C.1080801@FreeBSD.org> In-Reply-To: <520AD486.6050708@freebsd.org> References: <520A6D07.5080106@freebsd.org> <520A6EC6.6050208@FreeBSD.org> <520AD486.6050708@freebsd.org>
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On 08/13/13 17:51, Julian Elischer wrote: > On 8/14/13 1:37 AM, Navdeep Parhar wrote: >> On 08/13/13 10:29, Julian Elischer wrote: >> .. >>> Has anyone done any work on aggregating ACKs, or delaying responding to >>> them? >> If LRO is enabled on the FreeBSD receiver, ACKs are already aggregated >> (a duplicate ACK will result in an immediate flush though.) See >> tcp_lro_rx. > not always, , certainly not with XEN (xn0) on EC2. It will vary from driver to driver and how many frames a driver gets to (or chooses to) process in one run of its interrupt handler.
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