From: Edwin Török Date: Tue, 1 Nov 2022 17:59:17 +0000 (+0000) Subject: tools/ocaml/xenctrl: Use larger chunksize in domain_getinfolist X-Git-Url: http://xenbits.xensource.com/gitweb?a=commitdiff_plain;h=5d8f9cfa166c55a308856e7b021d778350edbd6c;p=people%2Ftklengyel%2Fxen.git tools/ocaml/xenctrl: Use larger chunksize in domain_getinfolist domain_getinfolist() is quadratic with the number of domains, because of the behaviour of the underlying hypercall. Nevertheless, getting domain info in blocks of 1024 is far more efficient than blocks of 2. In a scalability testing scenario with ~1000 VMs, a combination of this and the previous change takes xenopsd's wallclock time in domain_getinfolist() down from 88% to 0.02% Signed-off-by: Edwin Török Tested-by: Pau Ruiz Safont Acked-by: Christian Lindig (cherry picked from commit 95db09b1b154fb72fad861815ceae1f3fa49fc4e) --- diff --git a/tools/ocaml/libs/xc/xenctrl.ml b/tools/ocaml/libs/xc/xenctrl.ml index 85b73a7f6f..aa650533f7 100644 --- a/tools/ocaml/libs/xc/xenctrl.ml +++ b/tools/ocaml/libs/xc/xenctrl.ml @@ -233,7 +233,7 @@ let rev_append_fold acc e = List.rev_append e acc let rev_concat lst = List.fold_left rev_append_fold [] lst let domain_getinfolist handle first_domain = - let nb = 2 in + let nb = 1024 in let rec __getlist lst from = (* _domain_getinfolist returns domains in reverse order, largest first *) match _domain_getinfolist handle from nb with