Mailing List Archive

On Fri, Jan 6, 2017 at 10:28 AM, Vlad Rusu <vlad.rusu@lola.tech> wrote:
> Hi guys,
>
> https://www.varnish-cache.org/docs/4.1/reference/vsl.html
>
> Gzip tag, in the format section, shows a possible flag of ‘u’ representing a
> Gunzip-test
>
> In my varnishstat output I see how MAIN.n_gunzip equals (roughly)
> MAIN.backend_req
>
>
> Looking at the Gzip tag, I see the following for every backend request:
>
> Gzip u F - 70 55 80 80 489
>
>
> Can someone help me understand what a Gunzip-test means / does? It sure gets
> counted against MAIN.n_gunzip.

Hello Vlad,

The gunzip test is performed when an already-gzipped backend response
is inserted in the cache. It is inflated in a black-hole, only to make sure
that the object being fetched is proper gzip.

> Am not attaching the VCL or a full varnishstat as I don’t think it makes
> sense. Each backend sends gzipped data back to Varnish and each client
> requests for gzipped data from Varnish..

For each gzipped backend response, you will see this behavior (u flag
in logs, and counter increment). There is no separate counter for test
gunzip vs regular gunzip, although some of us would like to make the
distinction.

As an end-user, how and where would this be best documented in your
opinion?

Best Regards,
Dridi

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Thanks a lot Dridi!

That makes sense :)

To answer your 2nd question, I would have liked to see this documented as follows:

http://www.varnish-cache.org/docs/4.1/reference/varnish-counters.html <http://www.varnish-cache.org/docs/4.1/reference/varnish-counters.html> - in the n_gunzip section (i.e. includes the.. )

https://www.varnish-cache.org/docs/4.1/reference/vsl.html <https://www.varnish-cache.org/docs/4.1/reference/vsl.html> - in the Gzip tag section

https://varnish-cache.org/docs/4.1/phk/gzip.html <https://varnish-cache.org/docs/4.1/phk/gzip.html> - and here..


Thanks for your hard work on this cool product guys!

--
Vlad Rusu
skypeid: rusu.h.vlad | cell: +40758066019

Lola Tech | lola.tech <https://lola.tech/>
> On 06 Jan 2017, at 15:07, Dridi Boukelmoune <dridi@varni.sh> wrote:
>
> On Fri, Jan 6, 2017 at 10:28 AM, Vlad Rusu <vlad.rusu@lola.tech> wrote:
>> Hi guys,
>>
>> https://www.varnish-cache.org/docs/4.1/reference/vsl.html
>>
>> Gzip tag, in the format section, shows a possible flag of ‘u’ representing a
>> Gunzip-test
>>
>> In my varnishstat output I see how MAIN.n_gunzip equals (roughly)
>> MAIN.backend_req
>>
>>
>> Looking at the Gzip tag, I see the following for every backend request:
>>
>> Gzip u F - 70 55 80 80 489
>>
>>
>> Can someone help me understand what a Gunzip-test means / does? It sure gets
>> counted against MAIN.n_gunzip.
>
> Hello Vlad,
>
> The gunzip test is performed when an already-gzipped backend response
> is inserted in the cache. It is inflated in a black-hole, only to make sure
> that the object being fetched is proper gzip.
>
>> Am not attaching the VCL or a full varnishstat as I don’t think it makes
>> sense. Each backend sends gzipped data back to Varnish and each client
>> requests for gzipped data from Varnish..
>
> For each gzipped backend response, you will see this behavior (u flag
> in logs, and counter increment). There is no separate counter for test
> gunzip vs regular gunzip, although some of us would like to make the
> distinction.
>
> As an end-user, how and where would this be best documented in your
> opinion?
>
> Best Regards,
> Dridi

On Fri, Jan 6, 2017 at 2:40 PM, Vlad Rusu <vlad.rusu@lola.tech> wrote:
> Thanks a lot Dridi!

Hello,

We discussed this with the core team during last bug wash, and we'll
try to fix that the best we can.

> That makes sense :)
>
> To answer your 2nd question, I would have liked to see this documented as
> follows:
>
> http://www.varnish-cache.org/docs/4.1/reference/varnish-counters.html - in
> the n_gunzip section (i.e. includes the.. )

A new counter for test gunzip will be introduced in the next major release.

> https://www.varnish-cache.org/docs/4.1/reference/vsl.html - in the Gzip tag
> section

I will see to that separately, I think it will simply refer to the
counter's documentation once it lands. So that the canonical
description of test gunzip is found in one place.

> https://varnish-cache.org/docs/4.1/phk/gzip.html - and here..

I'm not touching that, it's a bit like a piece of Varnish history:
what phk had to say (in this case about gzip) when he wrote that. I
don't think we maintain the "random outbursts" besides typos.

> Thanks for your hard work on this cool product guys!

Thanks for your help!

Dridi

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> A new counter for test gunzip will be introduced in the next major release.

Hello,

A quick followup to let you know that it is now ready for 5.1, and
I added a description to the counter.

https://github.com/varnishcache/varnish-cache/commit/bad5e55

Dridi

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