On 07/11/16 at 21:52 +0100, Lucas Nussbaum wrote: > Hi, > > On 06/11/16 at 17:41 -0200, Henrique de Moraes Holschuh wrote: > > On Sun, 06 Nov 2016, Ben Hutchings wrote: > > > It's worth noting that TSX is broken in 'Haswell' processors and is > > > supposed to be disabled via a microcode update. I don't know whether > > > glibc avoids using it on these processors if the microcode update is > > > not applied. (Linux doesn't appear to hide the feature flags.) > > > > It does avoid it. For glibc libpthreads, Debian has blacklisted Intel > > TSX use [in libpthreads] on all of Haswell and much of Broadwell. > > > > But anything else *will* attempt to use it, people query cpuid directly > > for these things. You need a hypervisor that filters cpuid(). > > How can one know what glibc does on a given CPU? (preferably without > access to the hardware)
Answering myself, the relevant patch is https://sources.debian.net/src/glibc/2.24-5/debian/patches/amd64/local-blacklist-for-Intel-TSX.diff/ Lucas
