Wouter Verhelst <[email protected]> writes:
> On Fri, Apr 22, 2011 at 02:31:23PM +0200, folkert wrote:
>> Hi,
>>
>> I noticed something odd:
>>
>> for(;;) {
>>
>> // get timestamp in ms start
>>
>> read(fd, size_of_nbd_request)
>>
>> // get timestamp in ms end
>>
>> printf("delay: %f\n", end - start);
>>
>> // process request
>> }
>>
>> Then, on a localhost-connection with:
>> dd if=/dev/zero of=/dev/nbd0
>>
>> in this setup I noticed that it takes 5ms for the request header to come
>> in, but only when the processing takes a while.
>> What can be the cause of this?
>
> I'm not sure. I'm aware that nbd-server performance isn't exactly
> perfect, and I plan on working on that, but it would involve some
> significant work.
Could this be due to tcp corking? I.e. the kernel waiting for more data
to send in a single frame?
MfG
Goswin
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