Is it rock cache and how many workers are you using ? Sent from my iPhone
> On Feb 14, 2026, at 11:45, Brad House <[email protected]> wrote: > > > I've got a squid deployment where serving from cache can be slower than an > uncached download. I'm seeing speeds of around 50MB/s when serving from > cache, which is much slower than anticipated. Infact, when hitting fast > upstream servers, serving of a non-cached asset is faster (even though its > still hitting squid to fetch it). > > I'm thinking there's got to be something wrong with my squid configuration, > I'm currently running on Rocky Linux 10 with Squid 6.10-6. > > The VM I'm using currently has 4 cores, 16G RAM and 100G of usable space. I > used fio to measure disk performance and I got > > Random Write: 3629MiB/s (1MB block), 33.2k (4k block) IOPS > Random Read: 8391MiB/s (1MB block), 43.5k (4k block) IOPS > Adding more cpu cores or ram doesn't appear to impact performance. > > The underlying infrastructure is made up of hypervisors with dual 100G > uplinks, both the client and squid run on the same hypervisor cloud. Network > performance is not the issue. > > As a test, I spun up Apache Traffic Server and get over 800MB/s when serving > from cache. > > We have a large on site build system that spins up runners for GitHub > actions, and they're constantly fetching large assets from the internet for > each build, hence our desire for a caching proxy. We'd rather not switch to > Apache Traffic Server as that doesn't have SSL bump capability (we haven't > yet enabled that capability in squid, however). Hopefully there's a simple > configuration I'm missing. > > Just for testing I was pulling large image via http that is below my max > object size: > http://mirrors.edge.kernel.org/ubuntu-releases/20.04.6/ubuntu-20.04.6-live-server-amd64.iso > > Configuration below: > > acl public src 0.0.0.0/0 > acl SSL_ports port 443 > acl Safe_ports port 80 > acl Safe_ports port 443 > http_access deny !Safe_ports > http_access deny CONNECT !SSL_ports > http_access allow localhost manager > http_access deny manager > http_access allow public > http_access deny to_localhost > http_access deny to_linklocal > http_access deny all > http_port 8080 > maximum_object_size 2 GB > cache_dir aufs /var/spool/squid 325632 16 256 > cache_mem 1000 MB > maximum_object_size_in_memory 102400 KB > coredump_dir /var/spool/squid > refresh_pattern -i (/cgi-bin/|\?) 0 0% 0 > refresh_pattern deb$ 129600 100% 129600 > refresh_pattern udeb$ 129600 100% 129600 > refresh_pattern tar.gz$ 129600 100% 129600 > refresh_pattern tar.xz$ 129600 100% 129600 > refresh_pattern tar.bz2$ 129600 100% 129600 > refresh_pattern \/(Packages|Sources)(|\.bz2|\.gz|\.xz)$ 0 0% 0 refresh-ims > refresh_pattern \/Release(|\.gpg)$ 0 0% 0 refresh-ims > refresh_pattern \/InRelease$ 0 0% 0 refresh-ims > refresh_pattern \/(Translation-.*)(|\.bz2|\.gz|\.xz)$ 0 0% 0 refresh-ims > refresh_pattern changelogs.ubuntu.com\/.* 0 1% 1 > > > > Thanks! > > -Brad > > _______________________________________________ > squid-users mailing list > [email protected] > https://lists.squid-cache.org/listinfo/squid-users
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