Re: Re: Non Blocking write in apache (Apache Users)

Hi All,

I have a limitation for writev and readv to 52KB.

I was getting error for writev, therefore I changed THRESHOLD_MAX_BUFFER to 42KB. After that I was not getting any error.

Now in GET request of large file, I am getting the same 4022 error. This may be because of readv function.

Is there any buffer/place where I can restrict readv to 42KB only,so that it will not cross 52KB.

Thanks

Hemant

On Tue, Sep 18, 2018 at 2:18 PM Hemant Chaudhary <hemantdude.chaudhary@xxxxxxxxx> wrote:

Hi Yann,

42Kb works for me. Thanks for your support.

Regards,
Hemant

On Mon, Sep 17, 2018 at 9:16 PM Hemant Chaudhary <hemantdude.chaudhary@xxxxxxxxx> wrote:
If it will flush data then at what condition it will go to apr_poll function ??

What I understand is that if buffer is filled with 52KB data and writev is not ready then it should go into apr_poll().

Now the problem may exist with 42KB also.

I hope I am explained my issue.

Thanks
Hemant

On Sep 17, 2018 6:58 PM, "Yann Ylavic" <ylavic.dev@xxxxxxxxx> wrote:
Hi,

On Mon, Sep 17, 2018 at 1:51 PM Hemant Chaudhary
<hemantdude.chaudhary@xxxxxxxxx> wrote:
>
> in the apache error_log with trace6, it is trying to flush because it reached thresold_max_buffer. But at the same time, it is adding data in buffer which increases it size to to more than 52KB and fails on NonStop.

Yes, THRESHOLD_MAX_BUFFER is the limit *above* which the buffer is
flushed, but not the maximum number of bytes flushed...

> How should I stop apache so that it should go to select function till 52KB success.

The simpler would be to take a 10K margin, like defining
THRESHOLD_MAX_BUFFER to 42K.
Otherwise, you need a patch like the one attached (untested)...

Regards,
Yann.

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