Stuck with sc_rx_timeout

[Guillaume Quintard]

Don't worry about it, your client just left while you where expecting data
from it.

-- 
Guillaume Quintard

On Thu, Jun 8, 2017 at 3:32 PM, info at dubistmeinheld.de <
info at dubistmeinheld.de> wrote:

> Hi,
>
> I'm closely monitoring varnish 5.0 stats. I could fix some issues, but I
> am stuck on where sc_rx_timeout is coming from.
>
> Looking at the documentation, it says "Number of session closes with
> Error RX_TIMEOUT (Receive timeout)".
>
> I do not fully understand this sentence.
> - Is this a timeout expressing that varnish does not receive an answer
> within a certain time from the backend?
> - Do these timeouts happen from time to time and are ok, or is there an
> issue on the server (code, params?).
> - If parameters, which ones could be candidates to tune?
> - Also I have issues with more parameters like sc_req_http10 (please
> have a look below) and unsure if they are severe.
>
> I would be happy if you could point me in some direction.
>
> Cheers,
> Jens
>
> # /usr/sbin/varnishstat -1 | grep -i '\(err\|fail\|drop\)'
> MAIN.sess_drop               0         0.00 Sessions dropped
> MAIN.sess_fail               0         0.00 Session accept failures
> MAIN.client_req_400            2         0.00 Client requests received,
> subject to 400 errors
> MAIN.client_req_417            0         0.00 Client requests received,
> subject to 417 errors
> MAIN.backend_fail                 2         0.00 Backend conn. failures
> MAIN.fetch_failed                 0         0.00 Fetch failed (all causes)
> MAIN.fetch_no_thread              0         0.00 Fetch failed (no thread)
> MAIN.threads_failed               0         0.00 Thread creation failed
> MAIN.sess_dropped                 0         0.00 Sessions dropped for
> thread
> MAIN.sess_closed_err          21784         0.30 Session Closed with error
> MAIN.sc_req_http10             1223         0.02 Session Err REQ_HTTP10
> MAIN.sc_rx_bad                    0         0.00 Session Err RX_BAD
> MAIN.sc_rx_body                  34         0.00 Session Err RX_BODY
> MAIN.sc_rx_junk                   2         0.00 Session Err RX_JUNK
> MAIN.sc_rx_overflow               0         0.00 Session Err RX_OVERFLOW
> MAIN.sc_rx_timeout            20525         0.29 Session Err RX_TIMEOUT
> MAIN.sc_tx_error                  0         0.00 Session Err TX_ERROR
> MAIN.sc_overload                  0         0.00 Session Err OVERLOAD
> MAIN.sc_pipe_overflow             0         0.00 Session Err PIPE_OVERFLOW
> MAIN.sc_range_short               0         0.00 Session Err RANGE_SHORT
> MAIN.esi_errors                              0         0.00 ESI parse
> errors (unlock)
> SMA.s0.c_fail                                0         0.00 Allocator
> failures
> SMA.Transient.c_fail                         0         0.00 Allocator
> failures
>
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>
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