From: David Miller <davem@davemloft.net>
To: therbert@google.com
Cc: netdev@vger.kernel.org
Subject: Re: [PATCH] tcp: SO_TIMESTAMP implementation for TCP
Date: Fri, 30 Apr 2010 16:41:15 -0700 (PDT) [thread overview]
Message-ID: <20100430.164115.257514715.davem@davemloft.net> (raw)
In-Reply-To: <i2i65634d661004300058s5ee1b177oee249d3d22baad62@mail.gmail.com>
From: Tom Herbert <therbert@google.com>
Date: Fri, 30 Apr 2010 00:58:32 -0700
>> All these new checks and branches for a feature of questionable value.
>
>> If you can modify you apps to grab this information you can also probe
>> for the information using external probing tools.
>>
> I don't see an nice way to do that, we're profiling a significant
> percentage of millions of connections over thousands of paths as part
> of standard operations while incurring negligible overhead. The app
> can can easily timestamp its operations, but without some mechanism
> for getting timestamps out of a TCP connection, the networking portion
> of servicing requests is pretty much a black box in that.
If other people have an opinion about this, now would be the time
to speak up. :-)
next prev parent reply other threads:[~2010-04-30 23:41 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-04-30 6:07 [PATCH] tcp: SO_TIMESTAMP implementation for TCP Tom Herbert
2010-04-30 6:39 ` David Miller
2010-04-30 7:58 ` Tom Herbert
2010-04-30 23:41 ` David Miller [this message]
2010-05-01 5:07 ` Bill Fink
2010-05-01 5:40 ` Tom Herbert
2010-05-01 6:00 ` Eric Dumazet
2010-05-01 5:31 ` Tom Herbert
2010-05-01 12:06 ` Paul LeoNerd Evans
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