search for: queue_flag_virt

From: Christoph Hellwig <hch at lst.de> It seems like the addition of QUEUE_FLAG_VIRT caueses major performance regressions for Fedora users: https://bugzilla.redhat.com/show_bug.cgi?id=509383 https://bugzilla.redhat.com/show_bug.cgi?id=505695 while I can't reproduce those extreme regressions myself I think the flag is wrong. Rationale: QUEUE_FLAG_VIRT expands to QUEUE_F...

From: Christoph Hellwig <hch at lst.de> It seems like the addition of QUEUE_FLAG_VIRT caueses major performance regressions for Fedora users: https://bugzilla.redhat.com/show_bug.cgi?id=509383 https://bugzilla.redhat.com/show_bug.cgi?id=505695 while I can't reproduce those extreme regressions myself I think the flag is wrong. Rationale: QUEUE_FLAG_VIRT expands to QUEUE_F...

From: Christoph Hellwig <hch at lst.de> It seems like the addition of QUEUE_FLAG_VIRT caueses major performance regressions for Fedora users: https://bugzilla.redhat.com/show_bug.cgi?id=509383 https://bugzilla.redhat.com/show_bug.cgi?id=505695 while I can't reproduce those extreme regressions myself I think the flag is wrong. Rationale: QUEUE_FLAG_VIRT expands to QUEUE_F...

From: Christoph Hellwig <hch at lst.de> It seems like the addition of QUEUE_FLAG_VIRT caueses major performance regressions for Fedora users: https://bugzilla.redhat.com/show_bug.cgi?id=509383 https://bugzilla.redhat.com/show_bug.cgi?id=505695 while I can't reproduce those extreme regressions myself I think the flag is wrong. Rationale: QUEUE_FLAG_VIRT expands to QUEUE_F...

...surprising! Is it called something > other than "rotational"? > I'm not sure if we need to add this property in QEMU, but in Linux I found these flags (include/linux/blkdev.h) for the block queues: #define QUEUE_FLAG_NONROT 6 /* non-rotational device (SSD) */ #define QUEUE_FLAG_VIRT QUEUE_FLAG_NONROT /* paravirt device */ xen-blkfront driver is the only one that sets the QUEUE_FLAG_VIRT, should we do the same in the virtio-blk driver regardless of the backend? Thanks, Stefano

...surprising! Is it called something > other than "rotational"? > I'm not sure if we need to add this property in QEMU, but in Linux I found these flags (include/linux/blkdev.h) for the block queues: #define QUEUE_FLAG_NONROT 6 /* non-rotational device (SSD) */ #define QUEUE_FLAG_VIRT QUEUE_FLAG_NONROT /* paravirt device */ xen-blkfront driver is the only one that sets the QUEUE_FLAG_VIRT, should we do the same in the virtio-blk driver regardless of the backend? Thanks, Stefano

...uot;? > > > > > > > I'm not sure if we need to add this property in QEMU, but in Linux > > I found these flags (include/linux/blkdev.h) for the block queues: > > > > #define QUEUE_FLAG_NONROT 6 /* non-rotational device (SSD) */ > > #define QUEUE_FLAG_VIRT QUEUE_FLAG_NONROT /* paravirt device */ > > > > xen-blkfront driver is the only one that sets the QUEUE_FLAG_VIRT, > > should we do the same in the virtio-blk driver regardless of the backend? > > The ability to control this flag would be interesting for performance >...

...s' of git://git.kernel.org/.../bp/bp are available in the git repository at: ssh://master.kernel.org/pub/scm/linux/kernel/git/rusty/linux-2.6-for-linus.git master Christian Borntraeger (1): virtio: let header files include virtio_ids.h Christoph Hellwig (1): virtio_blk: revert QUEUE_FLAG_VIRT addition Rusty Russell (1): virtio_blk: Revert serial number support Uwe Kleine-K?nig (2): move virtballoon_remove to .devexit.text move virtrng_remove to .devexit.text Documentation/lguest/lguest.c | 1 - drivers/block/virtio_blk.c | 39 ++-----------------...

...s' of git://git.kernel.org/.../bp/bp are available in the git repository at: ssh://master.kernel.org/pub/scm/linux/kernel/git/rusty/linux-2.6-for-linus.git master Christian Borntraeger (1): virtio: let header files include virtio_ids.h Christoph Hellwig (1): virtio_blk: revert QUEUE_FLAG_VIRT addition Rusty Russell (1): virtio_blk: Revert serial number support Uwe Kleine-K?nig (2): move virtballoon_remove to .devexit.text move virtrng_remove to .devexit.text Documentation/lguest/lguest.c | 1 - drivers/block/virtio_blk.c | 39 ++-----------------...

...> other than "rotational"? > > > > I'm not sure if we need to add this property in QEMU, but in Linux > I found these flags (include/linux/blkdev.h) for the block queues: > > #define QUEUE_FLAG_NONROT 6 /* non-rotational device (SSD) */ > #define QUEUE_FLAG_VIRT QUEUE_FLAG_NONROT /* paravirt device */ > > xen-blkfront driver is the only one that sets the QUEUE_FLAG_VIRT, > should we do the same in the virtio-blk driver regardless of the backend? The ability to control this flag would be interesting for performance experiments. The problem with...

Dear list, This is the V4 of the trim support for xen-blkfront/blkback, Now we move BLKIF_OP_TRIM to BLKIF_OP_DISCARD, and dropped all "trim" stuffs in the patches, and use "discard" instead. Also we updated the helpers of blkif_x86_{32|64}_request or we will meet problems using a non-native protocol. And this patch has been tested with both SSD and raw file, with SSD we will

...ERGES 8 /* disable merge attempts */ #define QUEUE_FLAG_SAME_COMP 9 /* complete on same CPU-group */ #define QUEUE_FLAG_FAIL_IO 10 /* fake timeout */ #define QUEUE_FLAG_STACKABLE 11 /* supports request stacking */ #define QUEUE_FLAG_NONROT 12 /* non-rotational device (SSD) */ #define QUEUE_FLAG_VIRT QUEUE_FLAG_NONROT /* paravirt device */ #define QUEUE_FLAG_IO_STAT 13 /* do IO stats */ #define QUEUE_FLAG_DISCARD 14 /* supports DISCARD */ #define QUEUE_FLAG_NOXMERGES 15 /* No extended merges */ #define QUEUE_FLAG_ADD_RANDOM 16 /* Contributes to random pool */ #define QUEUE_FLA...

...ERGES 8 /* disable merge attempts */ #define QUEUE_FLAG_SAME_COMP 9 /* complete on same CPU-group */ #define QUEUE_FLAG_FAIL_IO 10 /* fake timeout */ #define QUEUE_FLAG_STACKABLE 11 /* supports request stacking */ #define QUEUE_FLAG_NONROT 12 /* non-rotational device (SSD) */ #define QUEUE_FLAG_VIRT QUEUE_FLAG_NONROT /* paravirt device */ #define QUEUE_FLAG_IO_STAT 13 /* do IO stats */ #define QUEUE_FLAG_DISCARD 14 /* supports DISCARD */ #define QUEUE_FLAG_NOXMERGES 15 /* No extended merges */ #define QUEUE_FLAG_ADD_RANDOM 16 /* Contributes to random pool */ #define QUEUE_FLA...