On 01/18/2018 05:35 PM, Ivan Larionov wrote: > * Multiple squid swap in or swap out ops reading/writing contiguous > blocks could be merged into one 256KB IO operation. > * Random squid operations could be handled as single 32KB IO operation. FWIW, on a busy Squid with a large disk cache in a stable state, there should be virtually no mergeable/contiguous swap requests (first bullet) due to random nature of rock slot assignment. Alex. > On Thu, Jan 18, 2018 at 3:20 PM, Amos Jeffries wrote: > > On 19/01/18 12:04, Ivan Larionov wrote: > > Thank you for the fast reply! > > read_ops and write_ops is AWS EBS metric and in general it > correlates with OS-level reads/s writes/s stats which iostat shows. > > So if I understand you correctly max-swap-rate doesn't limit > disk IOPS but limits squid swap ops instead and every squid > operation could in theory use more than 1 disk IO operation. > This means we can't really say "limit swap ops to 1500 because > our disk can handle 1500 iops" but should figure out the number > after testing different values. > > Ok, I suppose I'll just do what Rock documentation says – will > test different values and figure out what works for us. > > > > If you know what the OS level IOP size is (eg usually 4KB) and the > Squid rock IOP size Alex mentioned of 32KB. That should give you a > number to divide the disk IOPS limit you want with to get a rough > estimate for the appropriate Squid setting. > > The tuning bit is just to see how much variance from that is caused > by your traffic objects being different from the 32KB slot size. > > > Amos > > _______________________________________________ > squid-users mailing list > squid-users@xxxxxxxxxxxxxxxxxxxxx > <mailto:squid-users@xxxxxxxxxxxxxxxxxxxxx> > http://lists.squid-cache.org/listinfo/squid-users > <http://lists.squid-cache.org/listinfo/squid-users> > > > > > -- > With best regards, Ivan Larionov. > > > _______________________________________________ > squid-users mailing list > squid-users@xxxxxxxxxxxxxxxxxxxxx > http://lists.squid-cache.org/listinfo/squid-users > _______________________________________________ squid-users mailing list squid-users@xxxxxxxxxxxxxxxxxxxxx http://lists.squid-cache.org/listinfo/squid-users
