Re: r311568 makes freerdp very slow

From: Jakob Alvermark <jakob_at_alvermark.net>
Date: Fri, 13 Jan 2017 22:46:58 +0100 (CET)
On Fri, January 13, 2017 19:44, John Baldwin wrote:
> On Friday, January 13, 2017 09:58:01 AM Jakob Alvermark wrote:
>
>> On Thu, January 12, 2017 19:26, John Baldwin wrote:
>>
>>> On Thursday, January 12, 2017 12:42:11 PM Shawn Webb wrote:
>>>
>>>
>>>> On Thu, Jan 12, 2017 at 06:05:08PM +0100, Jakob Alvermark wrote:
>>>>
>>>>
>>>>> Hi,
>>>>>
>>>>>
>>>>>
>>>>> r311568 Set MORETOCOME for AIO write requests on a socket.
>>>>>
>>>>> After this commit freerdp is very slow.
>>>>>
>>>>>
>>>>>
>>>>> Before the password prompt would appear immediately when
>>>>> connecting to a server. Now it takes 5-10 seconds. After entering
>>>>> the password, another 5-10 seconds until I am connected. Once
>>>>> connected, there is a considerable lag.
>>>>>
>>>>>
>>>>> What could be the problem?
>>>>>
>>>>>
>>>>
>>>> I don't know what the problem is, but I am seeing the same symptom.
>>>>
>>>>
>>>
>>> Can you get a ktrace of the freerdp process during this?  The commit
>>> should only be setting MORETOCOME if multiple aio_write requests are
>>> queued to the same socket (so that TCP can batch them into a single
>>> packet). However, it should not affect an application just calling
>>> aio_write() on a socket once.
>>>
>>> --
>>> John Baldwin
>>>
>>
>> Hi John,
>>
>>
>> I got the ktrace, what do I do with it?
>>
>
> kdump will generate a text representation, perhaps using 'kdump -s' to not
> include dumps of raw I/O data.  If you can put the output of kdump at a
> URL I can fetch from then I can look at it.

OK, here it is: http://filebin.ca/38mkuLau9Yqu/ktrace.out.xfreerdp.txt

Thanks,

Jakob
Received on Fri Jan 13 2017 - 21:15:15 UTC

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