Hello.
--
cache_dir max-swap-rate documentation says that swap in requests contribute to measured swap rate. However in our squid 4 load test we see that read_ops + write_ops significantly exceeds the max-swap-rate we set and squid doesn't limit it.
I tried to set it to 200 to confirm that it actually works and saw that it does. Squid started warning about exceeding max-swap-rate. But looks like real limit is higher than the value we set in configuration.
Hardware:
AWS GP2 EBS (SSD) 600GB, 1500 iops baseline performance, 3000 iops burstable.
Config:
cache_dir rock /mnt/services/squid/cache 435200 swap-timeout=500 max-swap-rate=1200 slot-size=16384
IOPS squid pushes under our load test:
read ~800 ops/sec
write ~1100 ops/sec
In summary it gives us ~1900 ops/sec which exceeds AWS limit of 1500 ops/sec and after spending too much "burst balance" we started getting throttled from AWS side.
Could you please comment on this behavior? What the limit should we set to stay under 1500 ops/sec for swap in + swap out operations?
Thanks.
Squid version:
Squid Cache: Version 4.0.22
Service Name: squid
configure options: '--program-prefix=' '--prefix=/usr' '--exec-prefix=/usr' '--bindir=/usr/sbin' '--sbindir=/usr/sbin' '--sysconfdir=/etc/squid' '--libdir=/usr/lib' '--libexecdir=/usr/lib/squid' '--includedir=/usr/include' '--datadir=/usr/share' '--sharedstatedir=/usr/com' '--localstatedir=/var' '--mandir=/usr/share/man' '--infodir=/usr/share/info' '--enable-epoll' '--enable-removal-policies=heap,lru' '--enable-storeio=aufs,rock' '--enable-delay-pools' '--with-pthreads' '--enable-cache-digests' '--with-large-files' '--with-maxfd=16384' '--enable-htcp'
With best regards, Ivan Larionov.
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