[squid-users] Squid performance not able to drive a 1Gbps internet link

[Heiler Bemerguy]

Sorry Amos, but I've tested with modifying JUST these two sysctl 
parameters and the difference is huge.

Without maximum tcp buffers set to 8MB, I got a 110KB/s download speed, 
and with a 8MB kernel buffer I got a 9.5MB/s download speed (via squid, 
of course).

I think it has to do with the TCP maximum Window Size, the kernel can 
set on a connection.


-- 
Best Regards,

Heiler Bemerguy
Network Manager - CINBESA
55 91 98151-4894/3184-1751


Em 04/08/2016 03:16, Amos Jeffries escreveu:
> On 4/08/2016 2:32 a.m., Heiler Bemerguy wrote:
>> I think it doesn't really matter how much squid sets its default buffer.
>> The linux kernel will upscale to the maximum set by the third option.
>> (and the TCP Window Size will follow that)
>>
>> net.ipv4.tcp_wmem = 1024 32768 8388608
>> net.ipv4.tcp_rmem = 1024 32768 8388608
>>
> Having large system buffers like that just leads to buffer bloat
> problems. Squid is still the bottleneck if it is sending only 4KB each
> I/O cycle to the client - no matter how much is already received by
> Squid, or stuck in kernel queues waiting to arrive to Squid. The more
> heavily loaded the proxy is the longer each I/O cycle gets as all
> clients get one slice of the cycle to do whatever processing they need done.
>
> The buffers limited by HTTP_REQBUF_SZ are not dynamic so its not just a
> minimum. Nathan found a 300% speed increase from a 3x buffer size
> increase. Which is barely noticable (but still present) on small
> responses, but very noticable with large transactions.
>
> Amos
>
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