Displaying 5 results from an estimated 5 matches for "async_io".
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2016 Jun 06
2
LLD: Using sendfile(2) to copy file contents
...;>
>
> Pardon my ignorance here, but how might the kernel in general know what
> the "source" of a write is?
>
The kernel knows where all mmap'ed files are mapped. So, it can decides
whether a memory address is in a mmap'ed region or not, no?
Also, in terms of the async_io option, in my (non-llvm) experimentation
> with reading very large files the aio subsystem is not well-supported or
> optimized (hence the lack of Glibc support).
>
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2016 Jun 06
2
LLD: Using sendfile(2) to copy file contents
As to leave an opportunity for the kernel, I think mmap+write would be
enough. Because the kernel knows what address is mmap'ed, it can detect
that write's source is actually a mmap'ed file and if that's the case it
can optimize as it does for sendfile. It seems that Linux doesn't do that
now, though.
I haven't thought about using non-temporal stores. It may work as we
2017 Jun 01
3
libvirtd not accepting connections
Hi,
Ever since I recently upgraded to Fedora 25, I can't get kvm working.
It's worked on this system since initial fedora 20 install. All
upgrades were done via yum, then once available, dnf.
I do have libvirt-sock in LISTENING state: STREAM LISTENING
/var/run/libvirt/libvirt-sock
I noticed I also have multiple connections in CONNECTING state:
STREAM CONNECTING 0
2017 Jun 02
0
Re: libvirtd not accepting connections
..._nsec = 140519450703056}, st_mtim = {tv_sec = 140519321774352, tv_nsec
>= 140519450703024}, st_ctim = {tv_sec = 140520244259750, tv_nsec =
>140520310044608}, __glibc_reserved = {140520244259750, 140520310041179,
>140519321774320}}
> string_io = <optimized out>
> async_io = <optimized out>
> str = 0x7fcd3bf17420 "\260t\361;\315\177"
> tmpfd = <optimized out>
> __FUNCTION__ = "virCommandRun"
> __func__ = "virCommandRun"
>#5 0x00007fcd404a27cf in virQEMUCapsInitQMP (qmperr=0x7fcd...
2017 Jun 02
2
Re: libvirtd not accepting connections
...}, st_mtim = {tv_sec = 140519321774352, tv_nsec
>> = 140519450703024}, st_ctim = {tv_sec = 140520244259750, tv_nsec =
>> 140520310044608}, __glibc_reserved = {140520244259750, 140520310041179,
>> 140519321774320}}
>> string_io = <optimized out>
>> async_io = <optimized out>
>> str = 0x7fcd3bf17420 "\260t\361;\315\177"
>> tmpfd = <optimized out>
>> __FUNCTION__ = "virCommandRun"
>> __func__ = "virCommandRun"
>> #5 0x00007fcd404a27cf in virQEMUCapsI...